Add initial runner configuration and workflow for cluster initialization

.github/runner-config.yml

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+# Runner configuration for different AWS accounts
+# Format: environment_name: aws_account_id
+
+dev: dev-account-runner
+staging: staging-account-runner
+prod: prod-account-runner
+lab: lab-account-runner

.github/workflows/init-cluster-pr.yml

@@ -0,0 +1,108 @@
+name: Initialize Cluster Configuration
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [ opened, synchronize, reopened ]
+
+jobs:
+  determine-environment:
+    runs-on: ubuntu-latest
+    if: github.head_ref == 'init-cluster'
+    outputs:
+      aws_account: ${{ steps.get-account.outputs.aws_account }}
+      environment: ${{ steps.get-account.outputs.environment }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Get AWS account from config
+        id: get-account
+        run: |
+          AWS_ACCOUNT=$(jq -r '.aws_account' config.json)
+          ENVIRONMENT=$(jq -r '.environment' config.json)
+          echo "aws_account=${AWS_ACCOUNT}" >> $GITHUB_OUTPUT
+          echo "environment=${ENVIRONMENT}" >> $GITHUB_OUTPUT
+
+  expand-config:
+    needs: determine-environment
+    runs-on: [ "${{ needs.determine-environment.outputs.aws_account }}" ]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install Ansible
+        run: |
+          python -m pip install --upgrade pip
+          pip install ansible jinja2
+          
+      - name: Run HCL Generator
+        run: |
+          cd ansible
+          ansible-playbook generate_hcl_files.yml
+          
+      - name: Commit HCL Files
+        run: |
+          git config --global user.name "GitHub Actions Bot"
+          git config --global user.email "actions@github.com"
+          git add environment/
+          git commit -m "Generate HCL files from config" || echo "No changes to commit"
+          git push origin HEAD:${{ github.head_ref }}
+
+  terraform-plan:
+    needs: [ determine-environment, expand-config ]
+    runs-on: [ "${{ needs.determine-environment.outputs.aws_account }}" ]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3.1.2
+        with:
+          terraform_version: 1.9.1
+          terraform_wrapper: false
+
+      - name: Setup Terragrunt
+        run: |
+          wget -O terragrunt https://github.com/gruntwork-io/terragrunt/releases/download/v0.45.0/terragrunt_linux_amd64
+          chmod +x terragrunt
+          sudo mv terragrunt /usr/local/bin/
+          
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: arn:aws:iam::${{ needs.determine-environment.outputs.aws_account }}:role/GitHubActionsRole
+          aws-region: us-east-1
+
+      - name: Terragrunt Plan
+        working-directory: environment/region/vpc/cluster
+        run: |
+          terragrunt init
+          terragrunt plan -no-color -out=tfplan 2>&1 | tee plan.txt
+          
+      - name: Comment Plan on PR
+        uses: actions/github-script@v7
+        if: github.event_name == 'pull_request'
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const fs = require('fs');
+            const plan = fs.readFileSync('environment/region/vpc/cluster/plan.txt', 'utf8');
+            const comment = `### Terraform Plan Results
+            \`\`\`
+            ${plan}
+            \`\`\`
+            `;
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: comment
+            });