Set if statement to not run PR workflows on forks

Author: jaydrogers

.github/workflows/action_publish-images-prs.yml

@@ -1,28 +1,22 @@
-#################################
-# IMPORTANT NOTE:
-# We are commenting PRs out until we have a better way to allow
-# forks to securely upload to a Docker Registry without exposing
-# our own credentials.
-#################################
+name: Docker Publish (PR Images)
 
-# name: Docker Publish (PR Images)
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths:
+      - src/**
+      - .github/workflows/action_publish-images-**
+      - .github/workflows/service_docker-**
+      - scripts/**
 
-# on:
-#   workflow_dispatch:
-#   pull_request:
-#     types: [opened, synchronize, reopened]
-#     paths:
-#       - src/**
-#       - .github/workflows/action_publish-images-**
-#       - .github/workflows/service_docker-**
-#       - scripts/**
-
-# jobs:
-#   build-dev-images:
-#     uses: ./.github/workflows/service_docker-build-and-publish.yml
-#     with:
-#       registry-repositories: "docker.io/serversideup/php-dev" # Set to our development repository
-#       tag-prefix: "${{ github.event.pull_request.number }}"
-#       release-type: testing
-#       authenticate_with_ghcr: false
-#     secrets: inherit
+jobs:
+  build-dev-images:
+    if: ${{ github.event_name == 'pull_request' && ! github.event.pull_request.head.repo.fork }}
+    uses: ./.github/workflows/service_docker-build-and-publish.yml
+    with:
+      registry-repositories: "docker.io/serversideup/php-dev" # Set to our development repository
+      tag-prefix: "${{ github.event.pull_request.number }}"
+      release-type: testing
+      authenticate_with_ghcr: false
+    secrets: inherit