chore: deduplicate shellcheck lint command (pyinfra-dev#1891)

Author: 0xTaoZ

.github/workflows/shellcheck.yml

@@ -21,6 +21,4 @@ jobs:
       - name: Install shellcheck
         run: sudo apt-get update && sudo apt-get install -y shellcheck
       - name: Run shellcheck
-        run: |
-          git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' -- ':!*.py' \
-            | xargs shellcheck
+        run: scripts/dev-shellcheck.sh

scripts/dev-lint.sh

@@ -13,11 +13,6 @@ echo "Execute arguments type check..."
 uv run python scripts/lint_arguments_sync.py
 
 echo "Execute shellcheck..."
-if ! command -v shellcheck >/dev/null 2>&1; then
-    echo "shellcheck is not installed, see docs/contributing.md for instructions." >&2
-    exit 1
-fi
-git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' -- ':!*.py' \
-    | xargs shellcheck
+scripts/dev-shellcheck.sh
 
 echo "Linting complete!"

scripts/dev-shellcheck.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if ! command -v shellcheck >/dev/null 2>&1; then
+    echo "shellcheck is not installed, see docs/contributing.md for instructions." >&2
+    exit 1
+fi
+
+git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' -- ':!*.py' \
+    | xargs shellcheck