Add `--remove-files`to avoid running out of space

[jlanga]

Adding the --remove-files flag would prevent the following error:

Post job cleanup.
/usr/bin/tar --posix -cf cache.tzst --exclude cache.tzst -P -C /home/runner/work/owner/repo --files-from manifest.txt --use-compress-program zstdmt
zstd: error 70 : Write error : cannot write block : No space left on device 
/usr/bin/tar: cache.tzst: Wrote only 4096 of 10240 bytes
/usr/bin/tar: Child returned status 70
/usr/bin/tar: Error is not recoverable: exiting now
Warning: Failed to save: "/usr/bin/tar" failed with error: The process '/usr/bin/tar' failed with exit code 2

This would remove files as they are being added to the tarball.

Cheers!