CI: only run Ansible-lint on Ansible changes

Author: stsnel

.github/workflows/ansible-lint.yml

@@ -1,6 +1,18 @@
 name: Ansible Lint
 
-on: [push, pull_request]
+on:
+  push:
+    paths-ignore:
+    - 'README.md'
+    - 'Vagrantfile'
+    - 'docker/**'
+    - 'vagrant/**'
+  pull_request:
+    paths-ignore:
+    - 'README.md'
+    - 'Vagrantfile'
+    - 'docker/**'
+    - 'vagrant/**'
 
 jobs:
   build: