Simon Willison’s Weblog

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TILs

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TIL Commit a file if it changed — This recipe runs a Python script to update a README, then commits it back to the parent repo but only if it has changed:
19th Apr 2020, 5:27 pm
TIL Convert a datetime object to UTC without using pytz — I wanted to convert a datetime object (from GitPython) to UTC without adding the `pytz` dependency.
19th Apr 2020, 4:02 pm
TIL Set environment variables for all steps in a GitHub Action — From [this example](https://github.com/GoogleCloudPlatform/github-actions/blob/20c294aabd5331f9f7b8a26e6075d41c31ce5e0d/example-workflows/cloud-run/.github/workflows/cloud-run.yml) I learned that you can set environment variables such that they will be available in ALL jobs once at the top of a workflow:
19th Apr 2020, 2:55 pm
TIL Dump out all GitHub Actions context — Useful for seeing what's available for `if: ` conditions (see [context and expression syntax](https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions)).
19th Apr 2020, 2:50 pm
TIL Only run GitHub Action on push to master / main — Spotted in [this Cloud Run example](https://github.com/GoogleCloudPlatform/github-actions/blob/20c294aabd5331f9f7b8a26e6075d41c31ce5e0d/example-workflows/cloud-run/.github/workflows/cloud-run.yml):
19th Apr 2020, 2:46 pm

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