Add plugin test coverage to CI and BCR presubmit

- Add grafana_with_plugins_docker_test to Linux CI
- Add plugin build and test to BCR presubmit
- Update release.yml comment (BCR app is now installed)
- Clarify extensions.bzl comment about macOS OCI builds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: greggdonovan

.bcr/presubmit.yml

@@ -30,3 +30,9 @@ bcr_test_module_linux:
       build_targets:
         - "//example:grafana"
         - "//test:grafana"
+        - "//test:grafana_with_plugins"
+    test_oci:
+      name: "Test OCI targets (Linux only)"
+      test_targets:
+        - "//test:grafana_docker_test"
+        - "//test:grafana_with_plugins_docker_test"

.github/workflows/ci.yml

@@ -33,6 +33,11 @@ jobs:
         env:
           USE_BAZEL_VERSION: ${{ matrix.bazel }}
 
+      - name: Test Docker targets
+        run: bazel test //test:grafana_docker_test //test:grafana_with_plugins_docker_test
+        env:
+          USE_BAZEL_VERSION: ${{ matrix.bazel }}
+
   build-macos:
     runs-on: macos-latest
     strategy:

.github/workflows/release.yml

@@ -26,5 +26,5 @@ jobs:
             rules_grafana-*.tar.gz
             rules_grafana-*.tar.gz.sha256
           generate_release_notes: true
-        # The Publish to BCR GitHub App (if installed) will automatically
-        # detect this release and create a PR to the BCR
+        # The Publish to BCR GitHub App will automatically detect this
+        # release and create a PR to the BCR

grafana/extensions.bzl

@@ -28,9 +28,9 @@ _grafana_plugin_tag = tag_class(
 def _grafana_extension_impl(module_ctx):
     """Implementation for grafana module extension."""
 
-    # Pull default grafana container
-    # Note: Only linux/amd64 is supported. On macOS, Docker Desktop handles
-    # architecture translation via Rosetta. For CI, OCI builds are skipped on macOS.
+    # Pull default grafana container (linux/amd64 only).
+    # OCI image builds are skipped on macOS CI since rules_oci requires a matching
+    # host platform. For local macOS development, Docker Desktop emulates x86_64.
     oci_pull(
         name = "grafana_oci",
         image = "index.docker.io/grafana/grafana",