[chore] Update vscode launch configuration (#1556)

In order to get testrig we have to build with the debugenv tag and run
with the DEBUG environment variable. Since this is a Debug build this
also updates the launch configuration name to reflect that.

We do not build with `-ldflags="-s -w"` since that strips debug info.

This makes it possible to launch GtS from VS Code in debug mode, set
breakpoints in the editor etc.

.vscode/launch.json

@@ -2,14 +2,18 @@
 	"version": "0.2.0",
 	"configurations": [
 		{
-			"name": "Launch Package",
+			"name": "Debug Package",
 			"type": "go",
 			"request": "launch",
-			"mode": "auto",
+			"mode": "debug",
 			"program": "${workspaceFolder}/cmd/gotosocial",
 			"args": [
 				"testrig", "start"
 			],
+			"buildFlags": "-tags='netgo osusergo static_build kvformat debugenv'",
+			"env": {
+				"DEBUG": "1",
+			},
 			"cwd": "${workspaceFolder}"
 		}
 	]