Add pull request CI

.github/workflows/ci.yml

@@ -1,9 +1,11 @@
 name: CI
 
-on: push
+on:
+  push:
+  pull_request:
 
 jobs:
-  test:
+  test-script:
     runs-on: ubuntu-latest
     services:
       postgres:
@@ -46,35 +48,31 @@ jobs:
           mkdir -p "$BACKUP_DIR"
           sh -xe backup.sh
 
-  build:
+  test-docker:
+    if: ${{ github.event_name == 'pull_request' || github.ref != 'refs/heads/main' }}
+    needs: [ test-script ]
     runs-on: ubuntu-latest
-    if: ${{ github.ref != 'refs/heads/main' }}
-    needs: [ test ]
     steps:
       - uses: actions/checkout@v2
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-        with:
-          platforms: amd64,arm64,arm/v7,s390x,ppc64le
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
-      - name: Build images
+      - name: Test docker images build
         run: docker buildx bake --pull
 
   publish:
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+    needs: [ test-script ]
     runs-on: ubuntu-latest
-    if: ${{ github.ref == 'refs/heads/main' }}
-    needs: [ test ]
     steps:
       - uses: actions/checkout@v2
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-        with:
-          platforms: amd64,arm64,arm/v7,s390x,ppc64le
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1