feat: always set GO_ENV=development in make dev commands

gmus-backend/Makefile

@@ -25,6 +25,6 @@ migrate.make:
 	migrate create -ext sql -dir migrations -seq $(NAME)
 
 run.scan:
-	go run ./cmd/scan
+	GO_ENV=development go run ./cmd/scan
 run.server:
-	go run ./cmd/server
+	GO_ENV=development go run ./cmd/server

gmus-backend/README.md

@@ -36,15 +36,15 @@ After getting the [migrate CLI tool](https://github.com/golang-migrate/migrate/t
 
 This is intended to be run as a scheduled job. It will scan a directory and add relevant metadata to a PostgreSQL database.
 
-**Usage**
+**Development usage**
 
-`bin/scan`
+`make run.scan`
 
 ### REST/WebSocket API
 
-**Usage**
+**Development usage**
 
-`bin/server`
+`make run.server`
 
 This is an HTTP server running the following endpoints: