Allow to run CI on push to ci-branch

This PR allows to run the CI on push to a branch named "ci-*", without needing to open a PR.
- This will allow to make CI tests without opening a PR, e.g., for future `huggingface-hub` releases, future dependency releases (like `fsspec`, `pandas`,...)

Note that to build the documentation, we already allow it on push to a branch named "doc-builder*".

See:
- #5788

CC: @Wauplin  

_The documentation is not available anymore as the PR was closed or merged._

<details>
<summary>Show benchmarks</summary>

PyArrow==8.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.007852 / 0.011353 (-0.003500) | 0.005804 / 0.011008 (-0.005204) | 0.098268 / 0.038508 (0.059760) | 0.036440 / 0.023109 (0.013331) | 0.299952 / 0.275898 (0.024054) | 0.335590 / 0.323480 (0.012111) | 0.006332 / 0.007986 (-0.001653) | 0.004218 / 0.004328 (-0.000110) | 0.074733 / 0.004250 (0.070483) | 0.055252 / 0.037052 (0.018200) | 0.300854 / 0.258489 (0.042365) | 0.353442 / 0.293841 (0.059601) | 0.036447 / 0.128546 (-0.092099) | 0.012638 / 0.075646 (-0.063009) | 0.336680 / 0.419271 (-0.082591) | 0.052436 / 0.043533 (0.008903) | 0.292606 / 0.255139 (0.037467) | 0.319676 / 0.283200 (0.036476) | 0.111137 / 0.141683 (-0.030546) | 1.449569 / 1.452155 (-0.002586) | 1.558110 / 1.492716 (0.065394) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.306043 / 0.018006 (0.288037) | 0.563174 / 0.000490 (0.562684) | 0.032227 / 0.000200 (0.032027) | 0.000491 / 0.000054 (0.000436) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.029874 / 0.037411 (-0.007537) | 0.109330 / 0.014526 (0.094805) | 0.122579 / 0.176557 (-0.053978) | 0.181398 / 0.737135 (-0.555737) | 0.127124 / 0.296338 (-0.169215) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.417950 / 0.215209 (0.202741) | 4.163883 / 2.077655 (2.086228) | 1.985209 / 1.504120 (0.481089) | 1.793660 / 1.541195 (0.252465) | 1.895193 / 1.468490 (0.426703) | 0.694331 / 4.584777 (-3.890446) | 3.820170 / 3.745712 (0.074458) | 2.180556 / 5.269862 (-3.089305) | 1.490671 / 4.565676 (-3.075006) | 0.086132 / 0.424275 (-0.338143) | 0.012289 / 0.007607 (0.004682) | 0.511182 / 0.226044 (0.285137) | 5.117855 / 2.268929 (2.848927) | 2.403914 / 55.444624 (-53.040710) | 2.071107 / 6.876477 (-4.805369) | 2.184108 / 2.142072 (0.042036) | 0.835028 / 4.805227 (-3.970199) | 0.167707 / 6.500664 (-6.332957) | 0.066724 / 0.075469 (-0.008746) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.203921 / 1.841788 (-0.637867) | 15.214676 / 8.074308 (7.140368) | 14.971337 / 10.191392 (4.779945) | 0.170225 / 0.680424 (-0.510199) | 0.017924 / 0.534201 (-0.516277) | 0.428532 / 0.579283 (-0.150751) | 0.449157 / 0.434364 (0.014793) | 0.507723 / 0.540337 (-0.032614) | 0.615331 / 1.386936 (-0.771605) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.008172 / 0.011353 (-0.003181) | 0.005405 / 0.011008 (-0.005603) | 0.074684 / 0.038508 (0.036176) | 0.039133 / 0.023109 (0.016024) | 0.342598 / 0.275898 (0.066700) | 0.377752 / 0.323480 (0.054272) | 0.006655 / 0.007986 (-0.001331) | 0.005788 / 0.004328 (0.001459) | 0.074014 / 0.004250 (0.069763) | 0.056225 / 0.037052 (0.019173) | 0.342330 / 0.258489 (0.083841) | 0.381052 / 0.293841 (0.087211) | 0.036574 / 0.128546 (-0.091973) | 0.012472 / 0.075646 (-0.063174) | 0.087574 / 0.419271 (-0.331698) | 0.050178 / 0.043533 (0.006646) | 0.351116 / 0.255139 (0.095977) | 0.363772 / 0.283200 (0.080572) | 0.118313 / 0.141683 (-0.023370) | 1.436691 / 1.452155 (-0.015463) | 1.551397 / 1.492716 (0.058680) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.265201 / 0.018006 (0.247195) | 0.561855 / 0.000490 (0.561366) | 0.000463 / 0.000200 (0.000263) | 0.000058 / 0.000054 (0.000004) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.030540 / 0.037411 (-0.006871) | 0.118815 / 0.014526 (0.104289) | 0.127689 / 0.176557 (-0.048868) | 0.176211 / 0.737135 (-0.560924) | 0.133130 / 0.296338 (-0.163208) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.416318 / 0.215209 (0.201109) | 4.146806 / 2.077655 (2.069151) | 1.983437 / 1.504120 (0.479317) | 1.799733 / 1.541195 (0.258539) | 1.889026 / 1.468490 (0.420536) | 0.723330 / 4.584777 (-3.861447) | 3.817795 / 3.745712 (0.072083) | 2.158449 / 5.269862 (-3.111413) | 1.377348 / 4.565676 (-3.188328) | 0.088504 / 0.424275 (-0.335771) | 0.012560 / 0.007607 (0.004953) | 0.530382 / 0.226044 (0.304337) | 5.308529 / 2.268929 (3.039600) | 2.469655 / 55.444624 (-52.974970) | 2.136209 / 6.876477 (-4.740267) | 2.322997 / 2.142072 (0.180924) | 0.861396 / 4.805227 (-3.943831) | 0.172747 / 6.500664 (-6.327917) | 0.067617 / 0.075469 (-0.007852) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.263225 / 1.841788 (-0.578563) | 15.878025 / 8.074308 (7.803717) | 14.815627 / 10.191392 (4.624235) | 0.148722 / 0.680424 (-0.531702) | 0.018071 / 0.534201 (-0.516130) | 0.428389 / 0.579283 (-0.150894) | 0.428635 / 0.434364 (-0.005729) | 0.496953 / 0.540337 (-0.043385) | 0.592783 / 1.386936 (-0.794153) |

</details>
</details>

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