fix: parse immutable registry digest

lib/__tests__/video-transcode-deploy-drain.test.ts

@@ -449,6 +449,8 @@ describe('production video transcode drain gate', () => {
     expect(captureId).toBeGreaterThan(0)
     expect(captureDigest).toBeGreaterThan(captureId)
     expect(script).toContain('application/vnd.oci.image.index.v1+json')
+    expect(script).toContain('tolower($1) == "docker-content-digest:" { print $2 }')
+    expect(script).not.toContain("awk -F ': *' 'tolower($1) == \"docker-content-digest\"")
     expect(immutableReference).toBeGreaterThan(captureDigest)
     expect(remoteCompare).toBeGreaterThan(immutableReference)
     expect(payloadCompare).toBeGreaterThan(remoteCompare)

scripts/git-incremental-deploy.ps1

@@ -918,7 +918,7 @@ if [ "$SKIP_PUSH" != "1" ]; then
     -H 'Accept: application/vnd.oci.image.index.v1+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.docker.distribution.manifest.v2+json' \
     "http://localhost:${REGISTRY_PORT}/v2/${IMAGE_NAME}/manifests/${COMMIT_TAG}" \
     | tr -d '\r' \
-    | awk -F ': *' 'tolower($1) == "docker-content-digest" { print $2 }' \
+    | awk 'tolower($1) == "docker-content-digest:" { print $2 }' \
     | tail -n 1)"
   [[ "$EXPECTED_MANIFEST_DIGEST" =~ ^sha256:[0-9a-f]{64}$ ]] || fail "Registry did not return one immutable manifest digest for the exact commit tag"
   REGISTRY_COMMIT="${BUILD_SERVER_IP}:${REGISTRY_PORT}/${IMAGE_NAME}@${EXPECTED_MANIFEST_DIGEST}"