👷 misc(CI): use git-sumi hook to lint commit messages

.githooks/commit-msg

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Commit-msg hook generated by git-sumi.
+# For more information and documentation, visit: https://sumi.rs
+
+set -e  # Exit on any error.
+
+# Get the current branch name.
+current_branch=$(git rev-parse --abbrev-ref HEAD)
+
+# Check if the current branch is 'main'.
+if [ "$current_branch" != "main" ]; then
+    exit 0  # Exit successfully without running git-sumi.
+fi
+
+# Check if git-sumi is installed.
+if ! command -v git-sumi &> /dev/null
+then
+    echo "git-sumi is not installed. Please install it. See https://sumi.rs for instructions."
+    echo "Alternatively, edit or remove the commit-msg hook in .git/hooks/commit-msg."
+    exit 1
+fi
+
+# Run git-sumi on the commit message if on the 'main' branch.
+git-sumi -- "$(cat $1)"  # Exit with error if linting fails.