add conf for demo build

.github/workflows/build_demo.yml

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+name: Update gh docker image and triggers
+
+on:
+  # Triggers the workflow on releases
+  push:
+    branches:
+      - cekk_check_views
+    tags:
+      - "*"
+  pull_request:
+  # Allow to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build-image:
+    name: Build docker image
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get the image id
+        id: get_image_id
+        run: |
+          IMAGE_ID=$(echo ghcr.io/${{ github.repository }} | tr '[A-Z]' '[a-z]')
+          echo ::set-output name=IMAGE_ID::$IMAGE_ID
+
+      - name: Extract branch name
+        shell: bash
+        run: echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
+        id: extract_branch
+
+      - name: Get the version
+        id: get_version
+        run: |
+          VERSION="${{ steps.extract_branch.outputs.branch }}"
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          [ "$VERSION" == "main" ] && VERSION=latest
+          echo ::set-output name=VERSION::$VERSION
+
+      - name: Build and push container image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: {context}/Dockerfile.demo
+          push: true
+          tags: ${{ steps.get_image_id.outputs.IMAGE_ID }}:${{ steps.get_version.outputs.VERSION }}
+          platforms: linux/amd64,linux/arm64

Dockerfile.demo

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+FROM plone/plone-backend:6.0.4
+COPY docker/create-constraints.py docker/constraints.cfg docker/requirements.txt requirements-rer.txt mx.ini /app/
+
+
+COPY versions.cfg /
+
+RUN python create-constraints.py constraints.cfg constraints.txt && \
+    ./bin/pip install mxdev && \
+    ./bin/mxdev -c mx.ini && \
+    ./bin/pip install --ignore-requires-python -r requirements-mxdev.txt ${PIP_PARAMS} && \
+    find /app/lib -name LC_MESSAGES -exec chown -R plone:plone {} \;

mx.ini

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+[settings]
+requirements-in = requirements-iocomune.txt
+requirements-out = requirements-mxdev.txt
+contraints-out = constraints-mxdev.txt
+
+# custom variables
+github = https://github.com
+
+[design.plone.contenttypes]
+url = ${settings:github}/RedTurtle/design.plone.contenttypes.git
+branch = cekk_check_views

requirements-iocomune.txt

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+-r requirements.txt
+-c constraints.txt