Dockerfile

# build image
FROM centos:7 as builder
...
ARG BUILD_COMMIT=unknown
ARG BUILD_TIME=unknown
RUN go build -ldflags "-X github.com/xcoulon/go-url-shortener/configuration.BuildCommit=${BUILD_COMMIT} -X github.com/xcoulon/go-url-shortener/configuration.BuildTime=${BUILD_TIME}" -o bin/go-url-shortener
...

# final image
FROM centos:7
...
ARG BUILD_COMMIT=unknown
ARG BUILD_TIME=unknown
LABEL url-shortener.version=${BUILD_COMMIT} \
      url-shortener.build-time=${BUILD_TIME}
...