Feat: Added Docker CI/CD pipeline to automatically build and push Flask app to Docker Hub.

.dockerignore

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+# Python artifacts
+__pycache__/
+*.pyc
+
+# Virtual environment files
+venv/
+.venv/
+.tox/
+
+# Local configuration and logs (crucial for security/size)
+.env
+.DS_Store
+*.log
+tmp/

.github/workflows/docker-publish.yml

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+name: Docker Image Build and Publish
+
+on:
+  push:
+    branches:
+      - main # Trigger on any push to the main branch
+  workflow_dispatch: # Allows manual trigger
+
+# Grant write permissions for contents (to checkout code) and ID token (for authentication)
+jobs:
+  build_and_push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        
+      - name: Log in to Docker Hub
+        # Authenticates with Docker Hub using the secrets you provided
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/prompttune:latest
+          # We use 'latest' and a version tag for proper versioning
+          # You can add: ${{ secrets.DOCKERHUB_USERNAME }}/prompttune:v1.0

Dockerfile

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+# Use a Python base image, ideal for Flask applications
+FROM python:3.10-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt --default-timeout=1000 --retries=5
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["python", "app.py"]