Make action use environment based on branch name

[DutchJelly]

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Github environments integration into jobs

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Hi all,

I've been trying to run a github action on an environment based on branch name. Unfortunately, I'm unable to dynamically set the environment name using the branch name.

name: Docker Image CI

on:
  push:
    branches: [ "main", "staging" ]
  pull_request:
    branches: [ "main", "staging" ]
jobs:
  build:
    runs-on: ubuntu-latest
    environment: 
      name: ${GITHUB_REF##*/}
    steps:
    - uses: actions/checkout@v3
    - name: Set environment variables
      run: echo PORT ${{ vars.PORT }} && echo PORT ${{ env.PORT }}
    - name: Build the Docker image
      run: docker build . --file Dockerfile --tag express:${GITHUB_REF##*/}

These are my environments:

Does someone know how I could do this?

[airtower-luna]

This is Bash syntax, which isn't available outside run steps using Bash as the shell.

    environment:
      name: ${GITHUB_REF##*/}

You need to use Actions syntax instead. It looks like github.ref_name should be what you need:

    environment:
      name: ${{ github.ref_name }}

[DutchJelly]

This works. Thank you very much.

[jpenna]

There is an example on how to use the branch name to select secrects in the docs:

env:
  MY_ENV_VAR: ${{ github.ref == 'refs/heads/main' && 'value_for_main_branch' || 'value_for_other_branches' }}

https://docs.github.com/en/actions/learn-github-actions/expressions#example

[KronosTheLate]

Here is a multiline variant (from here):

environment: |-
  ${{
     github.ref_name == 'master' && 'production'
  || github.ref_name == 'dev'    && 'dev'
  ||                                'staging'
  }}

, where the dash in |- apparently ensures that the return value does not contain a newline.

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