Build fails if npm install in build command #255
Description
If you have npm ci or npm install in the build command, then the build will fail. You can reproduce with
go run cmd/cli/main.go build examples/node-npm --build-cmd "npm ci"
and you get this error
> npm ci:
0.236 npm warn config production Use `--omit=dev` instead.
0.425 npm error code EBUSY
0.425 npm error syscall rmdir
0.425 npm error path /app/node_modules/.cache
0.425 npm error errno -16
0.425 npm error EBUSY: resource busy or locked, rmdir '/app/node_modules/.cache'
0.426 npm error A complete log of this run can be found in: /root/.npm/_logs/2025-09-09T19_30_11_090Z-debug-0.log
------
ERRO failed to solve: failed to solve: process "sh -c npm ci" did not complete successfully: exit code: 240
If you comment out this line, then the build works.
For some reason the node_modules/.cache during the build step is causing issues. I initially thought that adding this cache during the install step would help, but I still get the same error.
We might want to detect if npm install is being run in build and remove that cache?