Feat: add healthz

Makefile

@@ -3,6 +3,7 @@
 
 SWAG ?= go run github.com/swaggo/swag/cmd/swag@v1.16.4
 DOCKER ?= docker
+COMPOSE ?= $(DOCKER) compose -p go2025-backend
 
 GO_ENV += CGO_ENABLED=0
 SOURCE := $(shell find . -type f -name '*.go')
@@ -15,7 +16,7 @@ swagger:
 	$(SWAG) init -o docs -g cmds/serve.go -pdl 1
 
 docker: $(TARGET)
-	$(DOCKER) compose up -d --force-recreate --build backend
+	$(COMPOSE) up -d --force-recreate --build backend
 
 $(TARGET): $(SOURCE)
 	$(GO_ENV) go build -o $@
@@ -27,16 +28,19 @@ test:
 	go test -v ./tests -count=1 -failfast
 
 postgres:
-	$(DOCKER) compose exec postgres psql \
+	$(COMPOSE) exec postgres psql \
 		postgres://go2025:go2025@postgres:5432/go2025?sslmode=disable
 
 test-ci: docker-quiet test docker-clean
 
 docker-quiet: $(TARGET)
-	$(DOCKER) compose -p go2025-backend up -d \
+	$(COMPOSE) up -d \
 		--force-recreate --build backend \
 		--quiet-build --quiet-pull
-	sleep 5
+	-for i in seq 10; do \
+		$(COMPOSE) exec postgres docker-ensure-initdb.sh && break; \
+		sleep 1; \
+	done
 
 docker-clean:
-	$(DOCKER) compose -p go2025-backend down -v --remove-orphans
+	$(COMPOSE) down -v --remove-orphans