Fix: build binary in dockerfile when running ci

Dockerfile

@@ -1,6 +1,20 @@
-FROM docker.io/library/debian:13-slim
+FROM docker.io/library/golang:1.25 AS build
 
-ADD backend /work/backend
+WORKDIR /work
+COPY . .
+RUN make backend
+
+FROM docker.io/library/debian:13-slim AS run
+
+COPY --from=build /work/backend /work/backend
+WORKDIR /work
+
+ENTRYPOINT ["/work/backend"]
+CMD ["serve"]
+
+FROM docker.io/library/debian:13-slim AS testing
+
+COPY backend /work/backend
 WORKDIR /work
 
 ENTRYPOINT ["/work/backend"]

docker-compose.yml

@@ -62,6 +62,7 @@ services:
   backend:
     build:
       context: .
+      target: testing
     env_file:
       - path: ./.env
         required: false