Example setup of GitHub action to deploy to multiple Google Cloud Run environments

deploy.yml

name: Deploy
on:
  push:
    tags:
      - '**'

env:
  RUN_REGION: europe-west1
  SERVICE_NAME: api

jobs:
  deploy:
    name: Deploy to CloudRun
    runs-on: ubuntu-latest

    steps:

      # Extract the current tag and set it as environment variable
      - name: Extract tag
        run: echo "::set-env name=TAG::$(echo ${GITHUB_REF##*/})"

      # This step stops the pipeline if current Tag doesn't contain 'staging' or 'production'
      - name: Invalid tag
        if:  (! contains(env.TAG, 'staging')) && (! contains(env.TAG, 'production'))
        run: |
          echo "Specify 'staging' or production in your tag."
          exit 1

      # If Tag contains 'staging', set staging environment
      - name: Set STAGING env
        if: contains(env.TAG, 'staging')
        run: |
          echo "::set-env name=PROJECT_ID::google-staging-project"
          echo "::set-env name=SECRET_KEY_NAME::GITHUB_STAGING_SECRET"

      # If Tag contains 'production', set production environment
      - name: Set PRODUCTION env
        if: contains(env.TAG, 'production')
        run: |
          echo "::set-env name=PROJECT_ID::google-production-project"
          echo "::set-env name=SECRET_KEY_NAME::GITHUB_PRODUCTION_SECRET"

      # Install and set gcloud
      - name: Set up gcloud
        uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
        with:
          project_id: ${{ env.PROJECT_ID }}
          service_account_key: ${{ secrets[env.SECRET_KEY_NAME] }}
          export_default_credentials: true

      # Deploy to CloudRun
      - name: Deploy to CloudRun
        run: |-
          gcloud run deploy "$SERVICE_NAME" \
            --quiet \
            --image "eu.gcr.io/my-container-project/$SERVICE_NAME:$GITHUB_SHA" \
            --region "$RUN_REGION" \
            --platform "managed" \
            --allow-unauthenticated \
            --memory=512Mi