Speed up migrations linting in CI

We’re running django-migrations-linter as part of our CI, it’s a great tool, thank you!

Do you have any recommendations on speeding up this step when using Github actions?

I did notice the --git-commit-id parameter, but was unable to make it work using the github.event.pull_request.sha variable. (Raises a diff error)

[0x962]

Thank you for your comments, @blueyed and @David-Wobrock.

For other people who stumble upon this thread and use this amazing tool, this is my Github actions implementation. ( The relevant steps )

      - name: Caches django migrations linter
        uses: actions/cache@v2
        with:
          path: |
            $HOME/.cache/django-migration-linter
          key: ${{ runner.os }}-migrations-linter-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-migrations-linter-${{ github.sha }}
            ${{ runner.os }}-migrations-linter-
            ${{ runner.os }}-

      - name: Run Migrations Linter
        run: MIGRATE=True python manage.py lintmigrations

[David-Wobrock]

[…] and use this amazing tool […]

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