one_release_label.yml

# Check to make sure there is one, and only one, release tag applied

name: Check for release labels
on: 
  pull_request:
    types: [opened, reopened, synchronize, labeled, unlabeled]
    branches: main

jobs:
  one_release_label:
    runs-on: ubuntu-latest
    steps:
      - name: At least one release label applied
        if: "!(contains(github.event.pull_request.labels.*.name, 'release-major') || contains(github.event.pull_request.labels.*.name, 'release-minor') || contains(github.event.pull_request.labels.*.name, 'release-patch'))"
        run: exit 1 
      - name: If major label is applied, no other release labels exist
        if: "contains(github.event.pull_request.labels.*.name, 'release-major') && (contains(github.event.pull_request.labels.*.name, 'release-minor') || contains(github.event.pull_request.labels.*.name, 'release-patch'))"
        run: exit 1 
      - name: If minor label is applied, no other release labels exist
        if: "contains(github.event.pull_request.labels.*.name, 'release-minor') && contains(github.event.pull_request.labels.*.name, 'release-patch')"
        run: exit 1