How to set workflow env variables depending on branch

Question

I currently have two GitHub actions workflow files that are pretty much identical, only one is configured to react to push/pull_requests on branch master the ot

Answer 1

You can drop the global env statement, combine the event triggers to

on:
  push:
    branches:
      - master
      - production
  pull_request:
    branches:
      - master
      - production

and then add a first step that checks which branch the workflow is running on and set the environment there:

      - name: Set environment for branch
        run: |
          if [[ $GITHUB_REF == 'refs/heads/master' ]]; then
              echo "GLCOUD_PROJECT=my-project-stg" >> "$GITHUB_ENV"
              echo "VERCEL_TARGET=staging" >> "$GITHUB_ENV"
          else
              echo "GLCOUD_PROJECT=my-project-prd" >> "$GITHUB_ENV"
              echo "VERCEL_TARGET=production" >> "$GITHUB_ENV"
          fi