use chainguard images for docker

Dockerfile

@@ -1,25 +1,10 @@
-ARG GOVERSION="1.16.2"
+FROM cgr.dev/chainguard/go:latest AS buildenv
+COPY . /build/
+WORKDIR /build
+RUN	make clean build STATIC=true
 
-FROM golang:${GOVERSION}-alpine AS buildenv
-
-ARG GOOS="linux"
-
-COPY . $GOPATH/src/
-WORKDIR $GOPATH/src
-
-RUN	apk add --quiet --no-cache \
-		build-base \
-		make \
-		git && \
-	make clean build STATIC=true
-
-FROM scratch
-ARG VERSION="0.7.0"
-LABEL org.opencontainers.image.title="tea - CLI for Gitea - git with a cup of tea"
-LABEL org.opencontainers.image.description="A command line tool to interact with Gitea servers"
-LABEL org.opencontainers.image.version="${VERSION}"
-LABEL org.opencontainers.image.authors="Tamás Gérczei <tamas@gerczei.eu>"
-LABEL org.opencontainers.image.vendor="The Gitea Authors"
-COPY --from=buildenv /go/src/tea /
+FROM cgr.dev/chainguard/static:latest
+COPY --from=buildenv /build/tea /tea
+VOLUME [ "/app" ]
 ENV HOME="/app"
 ENTRYPOINT ["/tea"]