add Dockerfile

Dockerfile

@@ -0,0 +1,28 @@
+FROM umputun/baseimage:buildgo-latest as backend
+
+ARG GIT_BRANCH
+ARG GITHUB_SHA
+ARG CI
+
+ENV GOFLAGS="-mod=vendor"
+
+ADD . /build
+WORKDIR /build
+
+RUN \
+    if [ -z "$CI" ] ; then \
+    echo "runs outside of CI" && version=$(/script/git-rev.sh); \
+    else version=${GIT_BRANCH}-${GITHUB_SHA:0:7}-$(date +%Y%m%dT%H:%M:%S); fi && \
+    echo "version=$version" && \
+    cd app && go build -o /build/reproxy -ldflags "-X main.revision=${version} -s -w"
+
+
+FROM umputun/baseimage:app-latest
+
+COPY --from=backend /build/reproxy /srv/reproxy
+RUN chmod +x /srv/reproxy
+
+WORKDIR /srv
+
+CMD ["/srv/reproxy"]
+ENTRYPOINT ["/init.sh"]