Cannot publish an electron app

[jdstrand]

@rwwagner90

unsquashfs electron-app/out/make/snap/x64/*.snap
snapcraft pack ./squashfs-root

But I am still getting the same error:

The store was unable to accept this snap.
  - found errors in file output: unusual mode 'rwsr-xr-x' for entry './swach/chrome-sandbox'
  - checksums do not match. Please ensure the snap is created with either 'snapcraft pack <DIR>' (using snapcraft >= 2.38) or 'mksquashfs <dir> <snap> -noappend -comp xz -all-root -no-xattrs -no-fragments'. If using electron-builder, please upgrade to latest stable (>= 20.14.7). See https://forum.snapcraft.io/t/automated-reviews-and-snapcraft-2-38/4982/17 for details.

If your build is running as root, then you need to add a chmod command. Eg:

# unsquashfs electron-app/out/make/snap/x64/*.snap
# chmod 755 ./squashfs-root/swach/chrome-sandbox
# snapcraft pack ./squashfs-root