Build: Add experimental build+watch with Air (#106834)

* Build: Add experimental build+watch with Air

* Codeowners: Add owner for .air.toml

* Makefile: Add installation reference for Air

.air.toml

@@ -0,0 +1,25 @@
+[build]
+bin = "./bin/grafana"
+args_bin = ["server", "-profile", "-profile-addr=127.0.0.1", "-profile-port=6000", "-profile-block-rate=1", "-profile-mutex-rate=5", "-packaging=dev", "cfg:app_mode=development"]
+cmd = "make GO_BUILD_DEV=1 build-backend"
+exclude_regex = ["_test.go", "_gen.go"]
+exclude_unchanged = true
+follow_symlink = true
+include_dir = ["apps", "conf", "devenv/dev-dashboards", "pkg", "public/views"]
+include_ext = ["go", "ini", "toml", "html", "json"]
+pre_cmd = ["make gen-go", "make gen-jsonnet"]
+rerun_delay = 1000
+stop_on_error = true
+
+[log]
+time = true
+
+[misc]
+clean_on_exit = false
+
+[proxy]
+enabled = false
+
+[screen]
+clear_on_rebuild = false
+keep_scroll = true

.github/CODEOWNERS

@@ -68,6 +68,7 @@
 /scripts/go-workspace @grafana/grafana-app-platform-squad
 /scripts/ci/backend-tests @grafana/grafana-operator-experience-squad
 /hack/ @grafana/grafana-app-platform-squad
+/.air.toml @macabu
 
 /pkg/apis/provisioning @grafana/grafana-git-ui-sync-team
 /public/app/features/provisioning @grafana/grafana-git-ui-sync-team

Makefile

@@ -266,6 +266,10 @@ run-go: ## Build and run web server immediately.
 run-frontend: deps-js ## Fetch js dependencies and watch frontend for rebuild
 	yarn start
 
+.PHONY: run-air
+run-air: ## [Experimental] Build and run backend, and watch for changes. See .air.toml for configuration. Check https://github.com/air-verse/air for installation instructions.
+	air -c .air.toml
+
 ##@ Testing
 
 .PHONY: test-go