add docker image labels, add docker image badge to readme

Specification for labels:
https://github.com/opencontainers/image-spec/blob/main/annotations.md

Dockerfile

@@ -82,6 +82,17 @@ RUN \
 
 FROM umputun/baseimage:app-v1.9.2
 
+ARG GITHUB_SHA
+
+LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>" \
+      org.opencontainers.image.description="Remark42 comment engine" \
+      org.opencontainers.image.documentation="https://remark42.com/docs/getting-started/" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.source="https://github.com/umputun/remark42.git" \
+      org.opencontainers.image.title="Remark42" \
+      org.opencontainers.image.url="https://remark42.com/" \
+      org.opencontainers.image.revision="${GITHUB_SHA}"
+
 WORKDIR /srv
 
 ADD docker-init.sh /entrypoint.sh

Dockerfile.artifacts

@@ -67,6 +67,18 @@ RUN \
 
 
 FROM alpine
+
+ARG GITHUB_SHA
+
+LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>" \
+      org.opencontainers.image.description="Remark42 comment engine" \
+      org.opencontainers.image.documentation="https://remark42.com/docs/getting-started/" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.source="https://github.com/umputun/remark42.git" \
+      org.opencontainers.image.title="Remark42" \
+      org.opencontainers.image.url="https://remark42.com/" \
+      org.opencontainers.image.revision="${GITHUB_SHA}"
+
 COPY --from=build-backend /build/backend/remark42.* /artifacts/
 RUN ls -la /artifacts/*
 CMD ["sleep", "100"]

README.md

@@ -1,4 +1,4 @@
-# Remark42 [![Build Status](https://github.com/umputun/remark42/workflows/build/badge.svg)](https://github.com/umputun/remark42/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/umputun/remark42)](https://goreportcard.com/report/github.com/umputun/remark42) [![Coverage Status](https://coveralls.io/repos/github/umputun/remark42/badge.svg?branch=master)](https://coveralls.io/github/umputun/remark42?branch=master) [![codecov](https://codecov.io/gh/umputun/remark42/branch/master/graph/badge.svg)](https://app.codecov.io/gh/umputun/remark42)
+# Remark42 [![Build Status](https://github.com/umputun/remark42/workflows/build/badge.svg)](https://github.com/umputun/remark42/actions) [![Image Size](https://img.shields.io/docker/image-size/umputun/remark42/master)](https://hub.docker.com/r/umputun/remark42) [![Go Report Card](https://goreportcard.com/badge/github.com/umputun/remark42)](https://goreportcard.com/report/github.com/umputun/remark42) [![Coverage Status](https://coveralls.io/repos/github/umputun/remark42/badge.svg?branch=master)](https://coveralls.io/github/umputun/remark42?branch=master) [![codecov](https://codecov.io/gh/umputun/remark42/branch/master/graph/badge.svg)](https://app.codecov.io/gh/umputun/remark42)
 
 Remark42 is a self-hosted, lightweight and simple (yet functional) comment engine, which doesn't spy on users. It can be embedded into blogs, articles, or any other place where readers add comments.
 

backend/_example/memory_store/Dockerfile

@@ -7,6 +7,17 @@ RUN go build -o /build/bin/memory_store -ldflags "-X main.revision=0.0.0 -s -w"
 
 FROM umputun/baseimage:app-v1.9.2
 
+ARG GITHUB_SHA
+
+LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>" \
+      org.opencontainers.image.description="Remark42 comment engine example JRPC memory store" \
+      org.opencontainers.image.documentation="https://github.com/umputun/remark42/tree/master/backend/_example/memory_store" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.source="https://github.com/umputun/remark42.git" \
+      org.opencontainers.image.title="Remark42 JRPC example memory store" \
+      org.opencontainers.image.url="https://remark42.com/" \
+      org.opencontainers.image.revision="${GITHUB_SHA}"
+
 WORKDIR /srv
 COPY --from=build-backend /build/bin/memory_store /srv/memory_store
 RUN chown -R app:app /srv