Add Dockerfile and build-docker make target

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.23-bookworm
+
+RUN apt-get update && apt-get upgrade -y
+
+RUN useradd -u 1000 -m user
+
+COPY ./gemserve /app/gemserve
+
+WORKDIR /app
+
+RUN chmod +x /app/gemserve && \
+    chown -R user:user /app
+
+USER user
+CMD ["/app/gemserve","0.0.0.0:1965"]

Makefile

@@ -37,6 +37,9 @@ lintfix: fmt
 build:
 	go build -o ./gemserve ./main.go
 
+build-docker:
+	docker build -t gemserve .
+
 show-updates:
 	go list -m -u all