Meta: Allow overlong 'fixup!' commit titles in pre-commit hook

.github/workflows/lintcommits.yml

@@ -3,6 +3,7 @@ name: Commit linter
 on: [pull_request_target]
 
 # Make sure to update Meta/lint-commit.sh to match this script when adding new checks!
+# (… but don't accept overlong 'fixup!' commit descriptions.)
 
 jobs:
   lint_commits:

Meta/lint-commit.sh

@@ -24,6 +24,8 @@ while read -r line; do
 
   # ignore comment lines
   [[ "$line" =~ ^#.* ]] && continue
+  # ignore overlong 'fixup!' commit descriptions
+  [[ "$line" =~ ^fixup!\ .* ]] && continue
 
   ((line_number += 1))
   line_length=${#line}