🤖 feat: simplify CI/CD structure and add Docker workflow

- Rename ci-cd.yaml to go-ci-cd.yaml for clarity
- Add dockerimage.yaml workflow for Docker builds
- Create Dockerfile for production deployment
- Add comprehensive CI/CD documentation
- Create contributor-quickstart.sh for easy validation
- Update all scripts to handle both workflow files
- Fix event triggers to run on all relevant pushes
- Remove redundant YAML syntax validation
- Improve workflow validation for Arcodange conventions

BREAKING CHANGE: ci-cd.yaml renamed to go-ci-cd.yaml
See scripts/cicd/README.md for complete documentation.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

.gitea/workflows/dockerimage.yaml

@@ -0,0 +1,83 @@
+--- 
+# DanceLessonsCoach Docker Image Build Workflow
+# Based on Arcodange webapp conventions
+# Builds and publishes Docker images to Gitea Container Registry
+
+name: Docker Build and Publish
+
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*.*.*'
+    paths-ignore:
+      - 'README.md'
+      - 'doc/**'
+      - 'adr/**'
+      - '.gitea/**'
+
+# cancel any previously-started, yet still active runs of this workflow on the same branch
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+# Arcodange-specific environment variables
+env:
+  GITEA_INTERNAL: "https://gitea.arcodange.lab/"
+  GITEA_EXTERNAL: "https://gitea.arcodange.fr/"
+  GITEA_ORG: "arcodange"
+  GITEA_REPO: "DanceLessonsCoach"
+  CI_REGISTRY: "gitea.arcodange.lab"
+
+jobs:
+  build-and-push-image:
+    name: Build and Push Docker Image
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.CI_REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.PACKAGES_TOKEN }}
+      
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      
+      - name: Build and push image to Gitea Container Registry
+        run: |-
+          # Determine tags based on event type
+          if [[ "${{ github.ref }}" == refs/tags/* ]]; then
+            # For tags, use the tag name and latest
+            TAGS="${{ github.ref_name }} latest"
+          else
+            # For main branch, use commit SHA and latest
+            TAGS="latest ${{ github.sha }}"
+          fi
+          
+          echo "Building Docker image with tags: $TAGS"
+          docker build -t dance-lessons-coach .
+          
+          for TAG in $TAGS; do
+            IMAGE_NAME="${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:$TAG"
+            echo "Tagging and pushing: $IMAGE_NAME"
+            docker tag dance-lessons-coach "$IMAGE_NAME"
+            docker push "$IMAGE_NAME"
+          done
+      
+      - name: Show published images
+        run: |-
+          echo "📦 Published Docker images:"
+          if [[ "${{ github.ref }}" == refs/tags/* ]]; then
+            echo "  - ${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:${{ github.ref_name }}"
+            echo "  - ${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:latest"
+          else
+            echo "  - ${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:latest"
+            echo "  - ${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:${{ github.sha }}"
+          fi