chore: add workflow for repository structure

Author: fiam

.github/workflows/existing-repo.yaml

@@ -0,0 +1,54 @@
+name: Update README from Template and Ensure necessary files are present
+
+on:
+  workflow_dispatch:
+    inputs:
+      target_branch:
+        description: 'Branch to update in the target repository'
+        required: true
+        default: 'main'
+
+jobs:
+  update-files:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout target repository
+      uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.inputs.target_branch }}
+
+    - name: Set up Git
+      run: |
+        git config user.name "github-actions"
+        git config user.email "[email protected]"
+
+    - name: Clone template repository
+      run: |
+        git clone https://github.com/dockersamples/sample-app-template.git template-repo
+
+    - name: Ensure README.md, CONTRIBUTING.md, and LICENSE
+      run: |
+        # Update README.md
+        cp template-repo/README.md README.md
+
+        # Check if CONTRIBUTING.md exists, if not copy from template
+        if [ ! -f CONTRIBUTING.md ]; then
+          echo "CONTRIBUTING.md not found, adding it."
+          cp template-repo/CONTRIBUTING.md CONTRIBUTING.md
+        fi
+
+        # Check if LICENSE file exists, if not copy from template
+        if [ ! -f LICENSE ]; then
+          echo "LICENSE.md not found, adding it."
+          cp template-repo/LICENSE LICENSE
+        fi
+
+    - name: Commit and push changes
+      run: |
+        git add README.md CONTRIBUTING.md LICENSE
+        git commit -m "Update README.md and ensure CONTRIBUTING.md and LICENSE are present" || echo "No changes to commit"
+        git push origin ${{ github.event.inputs.target_branch }}
+
+    - name: Clean up
+      run: rm -rf template-repo