Only run GitHub Action on push to master / main#

Spotted in this Cloud Run example:

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name: Build and Deploy to Cloud Run
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on:
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  push:
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    branches:
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    - master

Useful if you don’t want people opening pull requests against your repo that inadvertantly trigger a deploy action!

An alternative mechanism I’ve used is to gate the specific deploy steps in the action, like this.

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    # Only run the deploy if push was to master
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    - name: Set up Cloud Run
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      if: github.ref == 'refs/heads/master'
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      uses: GoogleCloudPlatform/github-actions/setup-gcloud@v0
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      with:
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        version: '275.0.0'
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        service_account_email: ${{ secrets.GCP_SA_EMAIL }}
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        service_account_key: ${{ secrets.GCP_SA_KEY }}
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    - name: Deploy to Cloud Run
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      if: github.ref == 'refs/heads/master'
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      run: |-
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        gcloud config set run/region us-central1