added post commit hook to run spotless command (#936)

## Description
1. Add a script to run spotless post commit
2. Since githooks are not tracked, moved them to a script folder with
symlink to the actual git hook

## Testing

<img width="913" height="782" alt="Screenshot 2025-08-12 at 2 47 20 PM"
src="https://github.com/user-attachments/assets/19c5055b-022e-4489-baf6-a12812f9d664"
/>

## Additional Notes to the Reviewer
1. Need to update README if the approach is finalised

NO_CHANGELOG=true

---------

Signed-off-by: Nikhil Suri <[email protected]>

Author: nikhilsuri-db

CONTRIBUTING.md

@@ -91,6 +91,14 @@ Additional git and GitHub resources:
 We recommend using IntelliJ to develop the Databricks JDBC Driver. You can download the community edition [here](https://www.jetbrains.com/idea/download/).
 Once you have IntelliJ installed, open the Databricks JDBC Driver project by selecting `File -> Open` and selecting the
 `databricks-jdbc` folder. Ensure that you have the Maven plugin loaded.
+- Git Hooks - To ensure commit quality and enforce project policies (such as with our new post-commit hook), you must install the git hooks contained in scripts/githooks.
+  Please run the following command after cloning the repository:
+  ```bash
+    chmod +x ./scripts/setup-git-hooks.sh
+  ````
+  ``` bash
+    ./scripts/setup-git-hooks.sh
+  ```
 
 ## Debugging
 

scripts/githooks/post-commit

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Run Maven spotless to auto-format (if needed)
+mvn spotless:apply
+
+# Check if there are any changes after formatting
+if ! git diff --quiet; then
+    echo
+    echo "========================================================================"
+    echo "✨ Spotless applied formatting changes after your commit."
+    echo "There are uncommitted changes in your working directory."
+    echo "Please 'git add' and 'git commit' these to include formatting changes."
+    echo "========================================================================"
+    echo
+    # Optional: show the changed files
+    git status --short
+else
+    echo
+    echo "✓ Spotless checked: No further formatting changes needed after commit."
+    echo
+fi

scripts/setup-git-hooks.sh

@@ -0,0 +1,2 @@
+ln -sf ../../scripts/githooks/post-commit .git/hooks/post-commit
+chmod +x .git/hooks/post-commit