ci: add shellcheck lint workflow

.github/workflows/lint.yml

@@ -0,0 +1,20 @@
+name: Lint
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install shellcheck
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y shellcheck
+
+      - name: Run shellcheck
+        run: shellcheck bin/wt

bin/wt

@@ -63,7 +63,7 @@ worktree_base() {
   else
     local root
     root="$(repo_root)"
-    echo "$(dirname "$root")"
+    dirname "$root"
   fi
 }
 
@@ -270,7 +270,7 @@ main() {
 
   case "$mode" in
     pick)
-      pick_worktree
+      pick_worktree ""
       ;;
     goto)
       goto_worktree "$branch"