Add documentation for setting up debugging in VSCode (#29987)

devenv/README.md

@@ -55,6 +55,9 @@ Jaeger block runs both Jaeger and Loki container. Loki container sends traces to
 | 1.0     | graphite1   | 8280              | 2203           | 2203        |
 | 0.9     | graphite09  | 8380              | 2303           | 2303        |
 
+## Debugging setup in VS Code
+An example of launch.json is provided in `devenv/vscode/launch.json`. It basically does what Makefile and .bra.toml do. The 'program' field is set to the folder name so VS Code loads all *.go files in it instead of just main.go.
+
 ## Troubleshooting
 
 ### Containers that read from log files fail to start (Mac OS)

devenv/vscode/launch.json

@@ -0,0 +1,21 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "grafana-server",
+      "type": "go",
+      "request": "launch",
+      "mode": "auto",
+      "program": "${workspaceFolder}/pkg/cmd/grafana-server",
+      "env": {},
+      "args": [
+          "--homepath=${workspaceFolder}",
+          "--packaging=dev",
+          "cfg:app_mode=development",
+      ]
+  }
+  ]
+}