Dockerfile

FROM golang:1.17-alpine as builder

# Now we DO need these, for the auto-labeling of the image
ARG BUILD_DATE
ARG VCS_REF

# Good docker practice, plus we get microbadger badges
LABEL org.label-schema.build-date=$BUILD_DATE \
      org.label-schema.vcs-url="https://github.com/Koellewe/traefik-forward-auth.git" \
      org.label-schema.vcs-ref=$VCS_REF \
      org.label-schema.schema-version="2.2-r1"


# Setup
RUN mkdir /app
WORKDIR /app

# Add libraries
RUN apk add --no-cache git && \
  go get "github.com/namsral/flag" && \
  go get "github.com/sirupsen/logrus"

# Copy & build
ADD . /app/
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix nocgo -o /traefik-forward-auth .

# Copy into final container
FROM alpine
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /traefik-forward-auth ./
ENTRYPOINT ["./traefik-forward-auth"]