build: perform validation on all base images for PRs (#1610)

.github/workflows/build-multiarch.yml

@@ -1,4 +1,4 @@
-name: Build and publish multiarch
+name: Test and Build multi-architecture
 on:
   push:
     branches:
@@ -10,6 +10,13 @@ on:
       - "*.md"
       - "docs/**"
       - "examples/**"
+  pull_request:
+    branches: [ master ]
+    types: [assigned, opened, synchronize, labeled]
+    paths-ignore:
+      - "*.md"
+      - "docs/**"
+      - "examples/**"
 
 jobs:
   build:
@@ -120,12 +127,6 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2.0.0
 
-      - name: Login to DockerHub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKER_USER }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-
       - name: Build for test
         uses: docker/build-push-action@v3.0.0
         with:
@@ -149,12 +150,23 @@ jobs:
         run: |
           tests/test.sh
 
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
       - name: Build and push
         id: docker_build
         uses: docker/build-push-action@v3.0.0
         with:
           platforms: ${{ matrix.platforms }}
-          push: ${{ github.ref_type == 'tag' || github.ref_name == 'master' }}
+          push: >
+            ${{ 
+            github.ref_type == 'tag' 
+            || github.ref_name == 'master' 
+            || ( github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'ci/push-image') )
+            }}
           tags: ${{ steps.meta.outputs.tags }}
           # ensure latest base image is used
           pull: true