build: add OCI release identity labels

Dockerfile

@@ -24,6 +24,14 @@ RUN BUILD_FLAGS="-s -w -X git.yuntuo.hk/k2safe/orbit/internal/buildinfo.Version=
 
 FROM scratch
 
+ARG VERSION=dev
+ARG REVISION=unknown
+ARG BUILD_TIME=unknown
+LABEL org.opencontainers.image.title="Orbit" \
+      org.opencontainers.image.version="${VERSION}" \
+      org.opencontainers.image.revision="${REVISION}" \
+      org.opencontainers.image.created="${BUILD_TIME}"
+
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=build /out/orbit /usr/local/bin/orbit
 COPY --from=build /out/orbit-migrate /usr/local/bin/orbit-migrate