Superlinter (by default) requires full git history

Teach it to work on just the files in place by using find instead of git
vars.

super-linter/super-linter#7282

Author: jasonkarns

.github/workflows/test.yml

@@ -17,4 +17,5 @@ jobs:
       - uses: super-linter/super-linter/slim@61abc07d755095a68f4987d1c2c3d1d64408f1f9 # v8.5.0
         env:
           GITHUB_TOKEN: ${{ github.token }}
+          USE_FIND_ALGORITHM: true # support detached-head checkouts
           VALIDATE_GIT_COMMITLINT: false # commitlint is bad