add labels and healthcheck

Dockerfile

@@ -7,5 +7,15 @@ RUN CGO_ENABLED=0 GOOS=`go env GOHOSTOS` GOARCH=`go env GOHOSTARCH` go build -o
 # Final Stage: Use a smaller base image and only include necessary files
 FROM scratch
 COPY --from=builder /app/out/aliveimage /app/aliveimage
-EXPOSE 8080
+ENV API_LISTEN_PORT=8080
+EXPOSE $API_LISTEN_PORT
 CMD ["/app/aliveimage"]
+
+HEALTHCHECK --interval=5s --timeout=3s --retries=3 CMD curl --fail http://localhost:$API_LISTEN_PORT/status || exit 1
+
+LABEL org.opencontainers.image.authors="Divanshu Chauhan <me@divkix.me>"
+LABEL org.opencontainers.image.url="https://divkix.me"
+LABEL org.opencontainers.image.source="https://github.com/divkix/aliveimage"
+LABEL org.opencontainers.image.title="Alive Image"
+LABEL org.opencontainers.image.description="Basic go app & docker image with simple json response."
+LABEL org.opencontainers.image.vendor="Divkix"