Add Porffor JS compiler

[lleyton]

See compiler-explorer/compiler-explorer#7656

[mattgodbolt]

This fails to install:

2025-05-12 12:22:42,661 lib.installation_context INFO     Moving from staging (/opt/compiler-explorer/staging/90aa4977-9d3b-44cc-b43d-bfc2f941c0a9/package) to final destination (/opt/compiler-explorer/porffor-0.57.24)
/opt/compiler-explorer/porffor-0.57.24/porf: 2: node: not found
2025-05-12 12:22:42,665 lib.ce_install  ERROR    compilers/javascript/porffor 0.57.24 installed OK, but doesn't appear as installed after
0 packages installed OK, 0 skipped, and 1 failed installation
Failed:
  compilers/javascript/porffor 0.57.24

[mattgodbolt]

(we don't have node installed globally)

[mattgodbolt]

We may have to work around this by using check_file instead of check_exe; the installation environment doesn't have node, nor will it be on the path. Either that or we declare a dependency on node of some sort and run it there. Either way the compiler explorer code will hit the same problem: unpacking javascript tarballs isn't something we've done before.