Implement notifications service with shared messaging and email drivers (#36)

Makefile

@@ -15,15 +15,36 @@ test-frontend:
 
 .PHONY: test-backend lint-backend run-backend
 
-test-backend:
+test-backend: generate-notifications
 	cd backend/shared && go test -race ./...
+	cd backend/notifications/interface && go test -race ./...
+	cd backend/notifications && go test -race ./...
 	cd backend/product && go test -race ./...
 
-lint-backend:
+lint-backend: generate-notifications
 	cd backend/product && go test ./architecture
 	cd backend && test -z "$$(gofmt -l .)"
 	cd backend/shared && go vet ./...
+	cd backend/notifications/interface && go vet ./...
+	cd backend/notifications && go vet ./...
 	cd backend/product && go vet ./...
 
 run-backend:
 	cd backend/product && go run .
+
+.PHONY: run-notifications generate-notifications
+run-notifications: generate-notifications
+	cd backend/notifications && go run .
+
+generate-notifications:
+	@command -v protoc >/dev/null
+	@tmp=$$(mktemp -d); trap 'rm -rf "$$tmp"' EXIT; \
+	GOBIN="$$tmp" go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.36.11 && \
+	GOBIN="$$tmp" go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.5.1 && \
+	PATH="$$tmp:$$PATH" protoc -I backend/notifications/interface/proto --go_out=backend/notifications/interface --go_opt=module=git.sendico.io/tech/sxchnge/notifications/interface --go-grpc_out=backend/notifications/interface --go-grpc_opt=module=git.sendico.io/tech/sxchnge/notifications/interface backend/notifications/interface/proto/v1/interface.proto
+
+.PHONY: package-notifications-interface
+package-notifications-interface: generate-notifications
+	mkdir -p dist
+	tar -czf dist/notifications-proto-v1.tar.gz -C backend/notifications/interface proto README.md
+	tar -czf dist/notifications-go-v1.tar.gz -C backend/notifications/interface go.mod go.sum notifications README.md