test: execute workflow with static path

Author: clay-lake

.github/workflows/Build_External_Rock.yaml

@@ -9,7 +9,8 @@ on:
 
 jobs:
     build:
-        uses: canonical/oci-factory/.github/workflows/Build-Rock.yaml@ROCKS-1452/oci-factory-refactor-build-rock-to-be-externally-reusable
+        # uses: canonical/oci-factory/.github/workflows/Build-Rock.yaml@ROCKS-1452/oci-factory-refactor-build-rock-to-be-externally-reusable
+        uses: canonical/oci-factory/.github/workflows/Build-Rock.yaml@5bd360cfc6a2024a64ae8dc4bd98a1280dc55aae
         with:
             oci-archive-name: "external_mock-rock"
             rock-repo: clay-lake/mock-rock