codespell: Exclude paths by patterns following pre-commit check conventions

In order to share `.codespellrc` between our CI checks and `pre-commit`
checks, we need to match paths without the leading `./`.  Convert to a
`bash` script so we can use `dotglob` to pass paths explicitly.

Unfortunately this means we can no longer run `codespell` manually with
no arguments.  Instead we can run `.gitlab/ci/codespell.bash`.

.codespellrc

@@ -5,18 +5,19 @@ check-hidden =
 quiet-level = 2
 builtin = clear,rare,en-GB_to_en-US
 
+# Skip paths matching fnmatch glob patterns.
 skip =
-  */.git,
-  */build,
-  */Copyright.txt,
-  */CTestCustom.cmake.in,
-  */Modules/Internal/CPack/NSIS.template.in,
-  */Source/CursesDialog/form/*,
-  */Source/kwsys/*,
-  */Tests/RunCMake/CPack/tests/DMG_SLA/German.*,
-  */Tests/RunCMake/ParseImplicitData/*.input,
-  */Tests/StringFileTest/test.utf8,
-  */Utilities/cm*,
+  .git,
+  build,
+  Copyright.txt,
+  CTestCustom.cmake.in,
+  Modules/Internal/CPack/NSIS.template.in,
+  Source/CursesDialog/form/*,
+  Source/kwsys/*,
+  Tests/RunCMake/CPack/tests/DMG_SLA/German.*,
+  Tests/RunCMake/ParseImplicitData/*.input,
+  Tests/StringFileTest/test.utf8,
+  Utilities/cm*,
   *.pfx,
 
 ignore-words-list =

.gitlab/ci/codespell.sh → .gitlab/ci/codespell.bash

@@ -4,8 +4,12 @@ set -e
 
 result=0
 
+# 'codespell' with no arguments adds a leading './' to all paths.
+# Avoid that by globbing top-level entries explicitly.
+shopt -s dotglob
 echo "Running 'codespell' on source code..."
-codespell || result=1
+codespell * || result=1
+shopt -u dotglob
 
 if [ -n "$CI_MERGE_REQUEST_DIFF_BASE_SHA" ]; then
   for COMMIT in $(git rev-list "^$CI_MERGE_REQUEST_DIFF_BASE_SHA" "$CI_COMMIT_SHA"); do

.gitlab/os-linux.yml

@@ -584,7 +584,7 @@
     stage: build
     extends: .fedora41
     script:
-        - .gitlab/ci/codespell.sh
+        - .gitlab/ci/codespell.bash
     interruptible: true
 
 .cmake_build_linux: