add dockerfile and gitea workflow

.gitea/workflows/prod-docker-images.yml

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+name: Build and Push Docker Container
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: '${{ secrets.ACTION_ACCESS_TOKEN }}'
+          submodules: recursive
+          lfs: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ vars.DOCKER_REGISTRY_URL }}
+          username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
+          password: ${{ secrets.ACTION_ACCESS_TOKEN }}
+
+      - name: Repo owner to lowercase (for Gitea namespace)
+        run: echo "REPO_OWNER_LC=$(echo '${{ gitea.repository_owner }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
+      - name: Build and push Docker image for latest tag
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ vars.DOCKER_REGISTRY_URL }}/${{ env.REPO_OWNER_LC }}/simple-nanoshare:latest
+          platforms: linux/amd64
+
+      - name: Invoke Portainer Stack Deployment
+        if: ${{ vars.PORTAINER_STACK_WEBHOOK_URL && vars.PORTAINER_STACK_WEBHOOK_URL != '' }}
+        uses: distributhor/workflow-webhook@v3
+        with:
+          webhook_url: ${{ vars.PORTAINER_STACK_WEBHOOK_URL }}

Dockerfile

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+FROM python:3.13-slim
+
+RUN apt-get update && \
+  apt-get install -y --no-install-recommends \
+    libssl-dev && \
+  rm -rf /var/lib/apt/lists/*
+
+# Install app
+COPY . /app
+WORKDIR /app
+
+# Install dependencies
+RUN pip install --upgrade pip && \
+    pip install --root-user-action=ignore -r requirements.txt
+
+EXPOSE 8000
+
+# Starten Sie Ihre Anwendung
+CMD ["hypercorn", "run:app", "--bind", "0.0.0.0:8000", "--workers", "1", "--websocket-ping-interval", "20", "--access-logfile", "-"]