[owners] Deploy from `amp-github-apps` repo and check in startup script + env about amp-github-apps HOT 4 CLOSED

The app uses a locally checked out copy of the repo to read the OWNERS files from. It's conceivably possible to fetch a listing of all files in the repo from the GitHub API, identify OWNERS files, fetch the contents of each individually, and parse from there (while monitoring each for changes to update on), but that's not something that's currently planned.

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Closing since #540 addresses some of this and makes the rest obsolete.

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(Incomplete list of) steps to clean up startup script:

• Check in current startup script
• Identify which steps of the startup script are required for initialization vs. re-deploying a new version
• Update the script to clone/pull from this repository instead of the old one living in GCP
• Identify which environment variables are used and by what (setup, Probot, and/or the app)
• Split into initialization and deployment scripts
• Instead of writing PEM key to a local file and setting PRIVATE_KEY_PATH env var, echo key through base64 and set as PRIVATE_KEY env var
• Migrate to dotenv environment configuration (if possible?)

from amp-github-apps.

Is there a specific reason why you need this to be a GCP instead of GAE instance? (which takes away 99% of the problems you're having)

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