chore: add Docker image and publish to DockerHub

.dockerignore

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+**/.git
+**/.gitignore
+**/.vscode
+**/coverage
+**/.env
+**/.ssh
+Dockerfile
+README.md
+docker-compose.yml
+**/venv
+**/env

.github/workflows/build_and_publish_docker_image.yml

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+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build_and_publish_docker_image:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Get Docker image tags
+        id: image_tags
+        run: |
+          IMAGE=italia/publiccode-issueopener
+
+          TAGS=${IMAGE}:latest
+          TAGS="$TAGS,${IMAGE}:${GITHUB_SHA::8}"
+
+          echo ::set-output name=tags::${TAGS}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.image_tags.outputs.tags }}

Dockerfile

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+FROM python:3.12-slim as build
+
+WORKDIR /app
+
+RUN addgroup --system app && adduser --system --home /home/app --group app
+
+USER app
+
+COPY requirements.txt .
+COPY templates/ templates/
+COPY main.py .
+
+RUN pip install -r requirements.txt
+
+CMD ["./main.py", "--help"]