fix: handle file paths containing spaces

[somaz94]

FILES was a space-joined string passed unquoted to shellcheck, so any path containing a space got word-split into fragments that do not exist. shellcheck printed openBinaryFile: does not exist on stderr and the file was never actually linted. Because reviewdog is last in the pipeline, the exit code was unaffected, so this failed silently.

This collects matches into an array via -print0 and passes "${files[@]}". The awk shebang pass now emits NUL-separated output to match. No mapfile/readarray, so the macOS runner (bash 3.2) still works.

Validation

Run locally with shellcheck 0.11.0, the version action.yml pins.

Using this repo's own step 4 config (path: . + ./testdata, check_all_files_with_shebangs: true) against the new fixtures:

before: 13 argv entries, spaced paths shattered into ./testdata/space , dir/spaced , test.sh
after:   7 argv entries, paths intact

Also checked:

• shellcheck --external-sources --severity=style script.sh is clean (same flags as the shellcheck-github-check step)
• parses under bash 3.2.57 and 5.3.9
• all four workflow step configs collect and exclude correctly
• the no-match path still prints No matching files found to check. and exits 0 under set -u on bash 3.2
• awk 'printf "%s%c", FILENAME, 0' verified to emit real NUL bytes on BSD awk for the macOS leg

Test fixtures

Added under testdata/space dir/ to cover both collection paths:

• spaced test.sh has a space in both the directory and the filename, and exercises the pattern find
• non-sh-test has a shebang and no .sh extension, and exercises the awk shebang find

Both names fall under the existing .gitattributes rules (*.sh and non-sh-test), so the Windows leg checks them out with LF and shebang matching still works.

Not addressed here

Step 4 lists overlapping paths (. and ./testdata), so testdata files are collected twice. That predates this change and is unaffected by it, so I left it alone.

closes: #41

[github-actions]

🚀 [bumpr] Bumped!
New version:v1.32.1
Changes:v1.32.0...v1.32.1