feat: Enhance GitHub Actions workflows and add YAML linting (#1020)

- Updated action descriptions for clarity in provision-k3s-vm-workers.
- Refactored steps in provision-k3s-vm-workers for improved readability.
- Adjusted permissions formatting in multiple workflows for consistency.
- Added YAML linting step in validate workflow to ensure YAML file quality.
- Introduced .yamllint configuration file for GitHub Actions YAML files.
- Enhanced Makefile to include a target for linting YAML files.

.github/workflows/chart.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
 
 permissions:
-    contents: write
+  contents: write
 
 env:
   HELM_VERSION: v4.1.3
@@ -17,7 +17,7 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
       with:
-          fetch-depth: 0
+        fetch-depth: 0
 
     - name: Configure Git
       run: |