Test docker build in PRs

Author: lucasssvaz

.github/workflows/docker.yml

@@ -7,6 +7,12 @@ on:
       - 'release/*'
     tags:
       - 'v*.*'
+  pull_request:
+    paths:
+      - ".github/workflows/docker.yml"
+      - "tools/config_editor/**"
+      - "tools/docker/**"
+      - "!**.md"
 
 env:
   # Build the image for amd64 and arm64
@@ -16,7 +22,7 @@ env:
 jobs:
   docker:
     # Disable the job in forks
-    if: ${{ github.repository_owner == 'espressif' }}
+    if: ${{ github.event_name == 'pull_request' || github.repository_owner == 'espressif' }}
 
     runs-on: ubuntu-latest
     steps:
@@ -29,50 +35,66 @@ jobs:
         run: |
           echo "CLONE_BRANCH_OR_TAG=$GITHUB_REF_NAME" >> $GITHUB_ENV
           echo "TAG_NAME=$GITHUB_REF_NAME" >> $GITHUB_ENV
+          echo "URL=${{ github.server_url }}/${{ github.repository }}.git" >> $GITHUB_ENV
+
       - name: Set variables (release branches)
         if: ${{ github.ref_type == 'branch' && startsWith(github.ref_name, 'release/') }}
         run: |
           echo "CLONE_BRANCH_OR_TAG=$GITHUB_REF_NAME" >> $GITHUB_ENV
           echo "TAG_NAME=release-${GITHUB_REF_NAME##release/}" >> $GITHUB_ENV
+          echo "URL=${{ github.server_url }}/${{ github.repository }}.git" >> $GITHUB_ENV
+
       - name: Set variables (main branch)
         if: ${{ github.ref_type == 'branch' && github.ref_name == 'master' }}
         run: |
           echo "CLONE_BRANCH_OR_TAG=master" >> $GITHUB_ENV
           echo "TAG_NAME=latest" >> $GITHUB_ENV
+          echo "URL=${{ github.server_url }}/${{ github.repository }}.git" >> $GITHUB_ENV
+
+      - name: Set variables (pull requests)
+        if: ${{ github.event_name == 'pull_request' }}
+        run: |
+          echo "CLONE_BRANCH_OR_TAG=${{ github.event.pull_request.head.ref }}" >> $GITHUB_ENV
+          echo "TAG_NAME=PR_${{ github.event.number }}" >> $GITHUB_ENV
+          echo "URL=${{ github.server_url }}/${{ github.event.pull_request.head.repo.full_name }}.git" >> $GITHUB_ENV
 
       # Display the variables set above, just in case.
       - name: Check variables
         run: |
           echo "CLONE_BRANCH_OR_TAG: $CLONE_BRANCH_OR_TAG"
           echo "CHECKOUT_REF: $CHECKOUT_REF"
           echo "TAG_NAME: $TAG_NAME"
+          echo "URL: $URL"
 
-      # The following steps are the standard boilerplate from
-      # https://github.com/marketplace/actions/build-and-push-docker-images
       - name: Checkout
         uses: actions/checkout@v4
+
       - name: Login to Docker Hub
+        if: ${{ github.event_name == 'push' }}
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Set up QEMU for multiarch builds
         uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
           context: tools/docker
-          push: true
+          push: ${{ github.event_name == 'push' }}
           tags: ${{ env.DOCKERHUB_REPO }}:${{ env.TAG_NAME }}
           platforms: ${{ env.BUILD_PLATFORMS }}
           build-args: |
-            LIBBUILDER_CLONE_URL=${{ github.server_url }}/${{ github.repository }}.git
+            LIBBUILDER_CLONE_URL=${{ env.URL }}
             LIBBUILDER_CLONE_BRANCH_OR_TAG=${{ env.CLONE_BRANCH_OR_TAG }}
 
       - name: Update Docker Hub repository description (master branch)
-        if: ${{ github.ref_type == 'branch' && github.ref_name == 'master' }}
+        if: ${{ github.event_name == 'push' && github.ref_type == 'branch' && github.ref_name == 'master' }}
         uses: peter-evans/dockerhub-description@v4
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}