Dev: Add debug command and build flags

Makefile

@@ -41,6 +41,7 @@ upgrade: dep-upgrade-js dep-upgrade
 clean-local: clean-local-config clean-local-cache
 clean-install: clean-local dep build-js install-bin install-assets
 dev: dev-npm dev-go-amd64
+debug-go: build-go-remote start-debug
 dev-npm:
 	$(info Upgrading NPM in local dev environment...)
 	sudo npm update -g npm
@@ -123,6 +124,8 @@ build-js:
 build-go:
 	rm -f $(BINARY_NAME)
 	scripts/build.sh debug $(BINARY_NAME)
+build-go-remote:
+	docker-compose exec -u root photoprism make build-go
 build-race:
 	rm -f $(BINARY_NAME)
 	scripts/build.sh race $(BINARY_NAME)
@@ -135,6 +138,8 @@ build-tensorflow:
 build-tensorflow-arm64:
 	docker build -t photoprism/tensorflow:arm64 docker/tensorflow/arm64
 	docker run -ti photoprism/tensorflow:arm64 bash
+start-debug:
+	docker-compose exec -u root photoprism dlv --listen=:40000 --headless=true --api-version=2 --accept-multiclient exec ./photoprism start
 watch-js:
 	(cd frontend &&	env NODE_ENV=development npm run watch)
 test-js:

docker-compose.yml

@@ -26,6 +26,7 @@ services:
     ports:
       - "2342:2342" # Web Server (PhotoPrism)
       - "2343:2343" # Acceptance Tests
+      - "40000:40000"
     working_dir: "/go/src/github.com/photoprism/photoprism"
     volumes:
       - ".:/go/src/github.com/photoprism/photoprism"

scripts/build.sh

@@ -29,7 +29,7 @@ fi
 
 if [[ $1 == "debug" ]]; then
   echo "Building development binary..."
-	go build -ldflags "-X main.version=${PHOTOPRISM_DATE}-${PHOTOPRISM_VERSION}-${PHOTOPRISM_OS}-${PHOTOPRISM_ARCH}-DEBUG" -o $2 cmd/photoprism/photoprism.go
+	go build -gcflags="all=-N -l" -ldflags "-X main.version=${PHOTOPRISM_DATE}-${PHOTOPRISM_VERSION}-${PHOTOPRISM_OS}-${PHOTOPRISM_ARCH}-DEBUG" -o $2 cmd/photoprism/photoprism.go
 	du -h $2
 	echo "Done."
 elif [[ $1 == "race" ]]; then