workflows: Holding Pen authorization

WIP for *basic* authorization in Holding Pen (relying on user being connected to "viewholdingpen" authorization).

* Adds basic "viewholdingpen" authorization to access the Holding Pen.
* Fixes PEP8 issues in local_config.py.

RFC on how to take authorization in Holding Pen to the next level is upcoming.

@kaplun 

1: D290 White spaces around docstring should be trimmed.
276:23: E203 whitespace before ':'
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300:27: E203 whitespace before ':'
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346:28: E222 multiple spaces after operator
355:22: E203 whitespace before ':'
367:48: E203 whitespace before ','
367:49: E231 missing whitespace after ','
375:16: E231 missing whitespace after ':'
388:16: E231 missing whitespace after ':'
495:16: E126 continuation line over-indented for hanging indent
501:58: E203 whitespace before ','
561:15: E126 continuation line over-indented for hanging indent
597:17: E203 whitespace before ':'
598:22: E203 whitespace before ':'
599:20: E203 whitespace before ':'
600:18: E203 whitespace before ':'
601:24: E203 whitespace before ':'
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604:20: E203 whitespace before ':'
605:23: E203 whitespace before ':'
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607:17: E203 whitespace before ':'
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610:21: E203 whitespace before ':'
611:19: E203 whitespace before ':'
612:19: E203 whitespace before ':'
613:20: E203 whitespace before ':'
614:17: E203 whitespace before ':'
615:24: E203 whitespace before ':'
616:23: E203 whitespace before ':'
617:21: E203 whitespace before ':'
618:37: E203 whitespace before ':'
632:4: E131 continuation line unaligned for hanging indent
661:1: W391 blank line at end of file