Nondeterministic hash for patterns with globbing

[norbertwnuk]

The files list seems to be unsorted, that causes action to return different hashes for the same pattern between runs.

Both single pattern with multiple files and multiple patterns with single match will be affected:

patterns: **/package-lock.json
patterns: |
  package-lock.json
  yarn.lock

Possible solution:

const files = (await getFiles(workdir, patterns, {gitignore, ignoreFiles})).sort()

[seepine]

Hi, i don't have time now, welcome PR.

[kubajanusz]

@seepine So I created PR with changes
#23