Add setup for TPU CI to run every hour.
Author: zcain117
Pull request: yes

Use GKE to run TPU CI testing once per hour using latest code in master branch.

Comments:
From previous PR:



**LysandreJik 4 hours ago Member**
Shouldn't the bert-based-case and bertBasedCase be bert-base-cased and bertBaseCased?

By the way, why is this model specific? Are we using these values somewhere?



**zcain117 19 minutes ago Author**
Fixed that typo.

The local bertBasedCase is just a name of that jsonnet variable, it just needs to be a unique string but several punctuation marks are not allowed in variable names. We recommend 1 variable like this per test. On our team we have 1 file per "family" of tests, e.g. 1 file for pytorch resnet50 where the file contains [short test, long test] X [v2-8 TPU, v3-8 TPU, v100 GPU(s)] for the same model on the same ML framework.

The modelName and frameworkPrefix are just used in generating the name of the GKE job. For example, a recent run was named: hf-bert-based-case-example-v3-8-vtgrj. Future runs will look like hf-bert-base-cased-example-v3-8-xxxxx

# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=h1) Report
> Merging [#6219](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/6695450a23545bc9d5416f39ab39609c7811c653&el=desc) will **decrease** coverage by `0.10%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/6219/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #6219      +/-   ##
==========================================
- Coverage   78.54%   78.44%   -0.11%     
==========================================
  Files         148      146       -2     
  Lines       27196    26586     -610     
==========================================
- Hits        21361    20855     -506     
+ Misses       5835     5731     -104     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_tf\_flaubert.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9mbGF1YmVydC5weQ==) | `24.22% <0.00%> (-63.51%)` | :arrow_down: |
| [src/transformers/trainer\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90cmFpbmVyX3V0aWxzLnB5) | `85.71% <0.00%> (-14.29%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_albert.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9hbGJlcnQucHk=) | `76.73% <0.00%> (-5.02%)` | :arrow_down: |
| [src/transformers/file\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9maWxlX3V0aWxzLnB5) | `80.05% <0.00%> (-2.14%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_mobilebert.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9tb2JpbGViZXJ0LnB5) | `23.58% <0.00%> (-0.97%)` | :arrow_down: |
| [src/transformers/modeling\_electra.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19lbGVjdHJhLnB5) | `81.55% <0.00%> (-0.58%)` | :arrow_down: |
| [src/transformers/pipelines.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9waXBlbGluZXMucHk=) | `79.36% <0.00%> (-0.43%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl91dGlscy5weQ==) | `86.97% <0.00%> (-0.33%)` | :arrow_down: |
| [src/transformers/modeling\_reformer.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19yZWZvcm1lci5weQ==) | `95.49% <0.00%> (-0.20%)` | :arrow_down: |
| [src/transformers/training\_args.py](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90cmFpbmluZ19hcmdzLnB5) | `80.19% <0.00%> (-0.20%)` | :arrow_down: |
| ... and [34 more](https://codecov.io/gh/huggingface/transformers/pull/6219/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=footer). Last update [6695450...6e4a41b](https://codecov.io/gh/huggingface/transformers/pull/6219?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


@LysandreJik let me know if there's anything else you can think of here