chore:metadata in dockerfile (#217)

* added additional metadata to our dockerfile

* simplified the healthcheck

server/Dockerfile

@@ -32,5 +32,10 @@ COPY --from=builder /etc/passwd /etc/passwd
 # Use an unprivileged user
 USER appuser
 
+# metadata
+EXPOSE 50051
+HEALTHCHECK  --interval=5m --timeout=3s \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:50051/health && exit 0 || exit 1
+
 # Run the main binary
 CMD ["/backend"]

server/main.go

@@ -116,8 +116,7 @@ func main() {
 	})
 
 	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Content-Type", "application/json")
-		_ = json.NewEncoder(w).Encode(map[string]string{"status": "healthy"})
+		_, _ = w.Write([]byte("healthy"))
 	})
 
 	static, _ := fs.Sub(swagfs, "swagger")