Add pull serverless build workflow

.github/workflows/serverless-build-pull.yaml

@@ -0,0 +1,31 @@
+name: serverless build (pull)
+
+on:
+  pull_request_target:
+    types: [ opened, edited, synchronize, reopened, ready_for_review ]
+
+permissions:
+  id-token: write # This is required for requesting the JWT token
+  contents: read # This is required for actions/checkout
+
+jobs:
+  build-image-serverless-controller:
+    uses: kyma-project/test-infra/.github/workflows/image-builder.yml@main # Usage: kyma-project/test-infra/.github/workflows/image-builder.yml@main
+    with:
+      name: function-controller/ga
+      dockerfile: components/serverless/deploy/manager/Dockerfile
+      context: .
+
+  build-image-serverless-webhook:
+    uses: kyma-project/test-infra/.github/workflows/image-builder.yml@main # Usage: kyma-project/test-infra/.github/workflows/image-builder.yml@main
+    with:
+      name: function-webhook/ga
+      dockerfile: components/serverless/deploy/webhook/Dockerfile
+      context: .
+
+  build-image-serverless-jobinit:
+    uses: kyma-project/test-infra/.github/workflows/image-builder.yml@main # Usage: kyma-project/test-infra/.github/workflows/image-builder.yml@main
+    with:
+      name: function-build-init/ga
+      dockerfile: components/serverless/deploy/jobinit/Dockerfile
+      context: .