tests: pr-build-extension workflow for PR check

.github/workflows/pr-build-extension.yaml

@@ -0,0 +1,49 @@
+#
+# Copyright (C) 2025 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+
+name: pr-build-extension
+
+on:
+  pull_request:
+    branches: [ 'main' ]
+
+jobs:
+  build-extension:
+    name: Build OCI image
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set image env var
+        id: set-image
+        run: echo "IMAGE=ghcr.io/${{ github.repository_owner }}/podman-desktop-image-checker-openshift-ext:pr-${{ github.event.pull_request.number }}" >> "$GITHUB_ENV"      
+
+      - name: Build image with podman
+        shell: bash
+        run: |
+          echo "Building image ${IMAGE} with podman"
+          podman build -t "${IMAGE}" -f Containerfile .
+          podman save -m -o podman-desktop-image-checker-openshift-ext.tar "${IMAGE}"
+          echo "${IMAGE}" > podman-desktop-image-checker-openshift-ext.image
+
+      - name: Upload extension oci flatten images
+        uses: actions/upload-artifact@de65e23aa2b7e23d713bb51fbfcb6d502f8667d8 # v4.6.2
+        with:
+          name: podman-desktop-image-checker-openshift-ext
+          path: podman-desktop-image-checker-openshift-ext*