Dockerfile with version data injection

Dockerfile

FROM docker.io/golang:1.11.4

# use go module by default
ENV GO111MODULE=on 

# declare workdir, create if does not exist
WORKDIR /service/

# Copy current dir in workdir
COPY . .

# Build go executable
RUN CGO_ENABLED=0 GOOS=linux go build -o app -a -installsuffix cgo \
  -ldflags "-X gitlab.private.fr/service.git/endpoint.GITCOMMIT=$(git describe --tags --match '[0-9]*\.[0-9]*\.[0-9]*') \
  -X gitlab.private.fr/service.git/endpoint.CIJOB=${CI_JOB_ID} \
  -X gitlab.private.fr/service.git/endpoint.BUILDTIME=$(date -u +%FT%T%z)" .

# Expose server listening port
FROM alpine:3.8

EXPOSE 8080

COPY --from=builder /service/app /app
RUN chmod +x /app
CMD ["/app"]