MGMT-19819: Add the commit reference from which the image is built to…

… the image (#7241)

Dockerfile.assisted-service

@@ -43,6 +43,9 @@ RUN cd ./cmd/operator && CGO_ENABLED=1 GOFLAGS="" GO111MODULE=on go build -o /bu
 RUN cd ./cmd/webadmission && CGO_ENABLED=1 GOFLAGS="" GO111MODULE=on go build -o /build/assisted-service-admission
 RUN cd ./cmd/agentbasedinstaller/client && CGO_ENABLED=1 GOFLAGS="" GO111MODULE=on go build -o /build/agent-installer-client
 
+# Extract the commit reference from which the image is built
+RUN git rev-parse --short HEAD > /commit-reference.txt
+
 # Create final image
 FROM quay.io/centos/centos:stream$RHEL_VERSION
 
@@ -95,6 +98,9 @@ RUN ln -s /usr/local/bin/agent-installer-client /agent-based-installer-register-
 ENV GODEBUG=madvdontneed=1
 ENV GOGC=50
 
+# Extract the commit reference from which the image is built
+COPY --from=builder /commit-reference.txt /commit-reference.txt
+
 USER $UID:$GID
 
 CMD ["/assisted-service"]