refactor Dockerfile and docker-compose.yml for multi-stage builds; update makefile for test execution

Dockerfile

@@ -8,7 +8,7 @@ COPY . .
 RUN go build -ldflags="-s -w" -o ./bin/web ./cmd/main.go
 
 # Runner stage
-FROM alpine:3.21
+FROM alpine:3.21 AS runner
 WORKDIR /app
 COPY .env .
 COPY --from=builder /app/bin/web /app/bin/web

docker-compose.yml

@@ -39,6 +39,7 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+      target: runner
     ports:
       - ${PORT}:8080
     environment:
@@ -50,6 +51,18 @@ services:
       - app
     command: ["/app/bin/web"]
 
+  
+  test:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: builder
+    volumes:
+      - .:/app
+    command: ["tail", "-f", "/dev/null"]
+    networks:
+      - app
+
 networks:
   app:
     driver: bridge

makefile

@@ -1,13 +1,17 @@
 include .env
 .PHONY: test
 test:
-	@docker compose exec app go test ./app
+	@docker compose up -d test
+	@docker compose exec test go test ./...
+	@docker compose stop test
 
 .PHONY: coverage
 coverage:
 	@mkdir -p coverage
-	@docker compose exec app go test -coverprofile=coverage.out ./internal/...
-	@docker compose exec app go tool cover -func=coverage.out -o coverage/coverage.txt
+	@docker compose up -d test
+	@docker compose exec test sh -c "go test -coverprofile=coverage.out ./internal/... && go tool cover -func=coverage.out -o coverage/coverage.txt"
+	@docker cp $(shell docker ps -q -f "name=fortunebet-test-1"):/app/coverage ./ || true
+	@docker compose stop test
 
 .PHONY: build
 build: