Add shellcheck pre-commit hook

Author: adamtheturtle

.pre-commit-config.yaml

@@ -44,6 +44,11 @@ repos:
     -   id: file-contents-sorter
         files: spelling_private_dict\.txt$
     -   id: trailing-whitespace
+-   repo: https://github.com/shellcheck-py/shellcheck-py
+    rev: v0.10.0.1
+    hooks:
+    -   id: shellcheck
+        args: ["--shell", "bash"]
 -   repo: local
     hooks:
     -   id: actionlint