ci(docker): containerize application and add forgejo deployment workflow

.dockerignore

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+.git
+.gitignore
+.agents
+.idea
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.pytest_cache

.forgejo/workflows/build-push.yml

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+name: Build and Push Docker Image to Forgejo Registry
+
+on:
+  push:
+    branches:
+      - main
+      - master
+      - fix_robustness_dockerize_project
+    tags:
+      - 'v*'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Forgejo Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ gitea.server_url }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ gitea.server_url }}/${{ gitea.repository }}
+          tags: |
+            type=raw,value=latest,enable=${{ gitea.ref == 'refs/heads/main' || gitea.ref == 'refs/heads/master' }}
+            type=sha,prefix=
+
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.gitignore

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+.idea/
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.pytest_cache/
+.agents/

Dockerfile

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+# Use official lightweight Python base image
+FROM python:3.11-slim
+
+# Set working directory inside container
+WORKDIR /app
+
+# Install Python dependencies first to leverage Docker layer caching
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application files
+COPY . .
+
+# Expose default port
+EXPOSE 8000
+
+# Set default environment variables
+ENV PORT=8000
+ENV USER_AGENT="Phikipathia/1.0 (Wikipedia Philosophy Path Visualizer; https://github.com/tdpeuter/2022ST-project-Phikipathia)"
+
+# Run Python HTTP server
+CMD ["python", "server.py"]

docker-compose.yml

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+services:
+  phikipathia:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: ${DOCKER_REGISTRY:-phikipathia}:${DOCKER_TAG:-latest}
+    container_name: phikipathia-app
+    restart: unless-stopped
+    ports:
+      - "${PORT:-8000}:8000"
+    environment:
+      - PORT=8000
+      - USER_AGENT=${USER_AGENT:-Phikipathia/1.0 (https://github.com/tdpeuter/2022ST-project-Phikipathia)}
+    healthcheck:
+      test: ["CMD-SHELL", "python -c 'import urllib.request; urllib.request.urlopen(\"http://localhost:8000/\")'"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 5s
+    deploy:
+      resources:
+        limits:
+          cpus: '1.0'
+          memory: 512M
+        reservations:
+          cpus: '0.25'
+          memory: 128M