docker & linting & dependatbot

This commit introduces linter and dependabot to monitor dependencies.
It also adds a dockerfile and a workflow to build the image.

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: monthly
+
+- package-ecosystem: docker
+  directory: /
+  schedule:
+    interval: monthly

.github/workflows/publish-docker-image.yml

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+name: Publish Docker image
+
+on:
+  push:
+
+jobs:
+  push_to_registries:
+    name: Push Docker image to multiple registries
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/test.yml

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+name: bandit and flake8
+
+on:
+  push:
+    branches-ignore:
+      - 'dependabot/**'
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # https://endoflife.date/python
+        # https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2204-Readme.md#python
+        python-version:
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: set up python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - run: pip install -r requirements.txt
+
+    - run: pip install flake8 bandit
+
+    - run: flake8 *.py
+
+    - run: bandit *.py

.gitignore

@@ -1 +1,4 @@
 .env
+venv/
+__pycache__/
+

Dockerfile

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+FROM python:3.9-slim
+EXPOSE 8501
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY . /app
+WORKDIR /app
+
+HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health
+
+CMD [ "streamlit", "run", "app.py", "--server.port=8501", "--server.address=0.0.0.0"]