debugging: add a separate start:debug-brk target

--inspect-brk is useful if you want to debug something during startup

package.json

@@ -7,7 +7,8 @@
   "repository": "git://github.com/gristlabs/grist-core.git",
   "scripts": {
     "start": "sandbox/watch.sh",
-    "start:debug": "NODE_INSPECT=1 sandbox/watch.sh",
+    "start:debug": "NODE_INSPECT=--inspect sandbox/watch.sh",
+    "start:debug-brk": "NODE_INSPECT=--inspect-brk sandbox/watch.sh",
     "install:python": "buildtools/prepare_python.sh",
     "install:python2": "buildtools/prepare_python2.sh",
     "install:python3": "buildtools/prepare_python3.sh",

sandbox/watch.sh

@@ -19,6 +19,6 @@ tsc --build -w --preserveWatchOutput $PROJECT &
 css_files="app/client/**/*.css"
 chokidar "${css_files}" -c "bash -O globstar -c 'cat ${css_files} > static/bundle.css'" &
 webpack --config $WEBPACK_CONFIG --mode development --watch &
-NODE_PATH=_build:_build/stubs:_build/ext nodemon ${NODE_INSPECT:+--inspect} --delay 1 -w _build/app/server -w _build/app/common _build/stubs/app/server/server.js &
+NODE_PATH=_build:_build/stubs:_build/ext nodemon ${NODE_INSPECT} --delay 1 -w _build/app/server -w _build/app/common _build/stubs/app/server/server.js &
 
 wait