Make check-mode.sh usable on macOS

The version of `bash` on macOS is old and doed not have `lastpipe`.
This uses process substitution instead.

This also fixes the name of the CI job to be the same as the script
basename and `justfile` recipe. (I'm not sure if `check-mode` or
`check-modes` is better, but the same one should be used for each.)

.github/workflows/ci.yml

@@ -359,7 +359,7 @@ jobs:
       - name: gix-pack with all features (including wasm)
         run: cd gix-pack && cargo build --all-features --target "$TARGET"
 
-  check-modes:
+  check-mode:
     # FIXME: Only run this on ubuntu-latest (don't use a matrix).
     strategy:
       fail-fast: false

etc/check-mode.sh

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
 set -eu -o pipefail
-shopt -s lastpipe
 
 # Go to the worktree's root. (Even if the dir name ends in a newline.)
 root_padded="$(git rev-parse --show-toplevel && echo -n .)"
@@ -29,13 +28,13 @@ function check () {
   status=1
 }
 
-# For now, check just regular files named with a `.sh` suffix.
-git ls-files -sz -- '*.sh' | while read -rd '' mode oid _stage_number path; do
+# Check regular files named with a `.sh` suffix.
+while read -rd '' mode oid _stage_number path; do
   case "$mode" in
   100644 | 100755)
     check "$mode" "$oid" "$path"
     ;;
   esac
-done
+done < <(git ls-files -sz -- '*.sh')
 
 exit "$status"