Invoke these scripts via npm run and chain them with double ampersand &&:
"start": "npm run build&& npm run post_build"
Or, if you like to keep them as separate npm scripts, add a script that runs build commands to Before launch section of run configuration that executes your other custom entry
Invoke these scripts via npm run and chain them with double ampersand
&&:Or, if you like to keep them as separate npm scripts, add a script that runs build commands to Before launch section of run configuration that executes your other custom entry