fix(ci): missing commit hash in docker builds (#79)

Author: nuxencs

.github/workflows/build.yaml

@@ -147,7 +147,7 @@ jobs:
           build-args: |
             BUILDTIME=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
             VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
-            REVISION=${{ github.event.pull_request.head.sha }}
+            REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
           provenance: false