Introduce GitHub Actions and Workflows

.github/workflows/containerfile.yml

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+name: Build and Push Container Image
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'Containerfile'
+      - 'pyproject.toml'
+      - 'uv.lock'
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha,prefix=
+
+      - name: Build and push container image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Containerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/copilot.yml

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+name: GitHub Copilot Dev Environment
+
+on:
+  workflow_dispatch:
+
+jobs:
+  copilot:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/${{ github.repository }}:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Sync dependencies
+        run: uv sync --frozen
+
+      - name: Setup Copilot environment
+        run: |
+          echo "Development environment ready for GitHub Copilot"
+          echo "Python version: $(python --version)"
+          echo "uv version: $(uv --version)"
+          uv pip list

.github/workflows/on_pr.yml

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+name: PR Tests
+
+on:
+  pull_request:
+    branches: [main]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/${{ github.repository }}:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install dependencies with uv
+        run: uv sync --frozen
+
+      - name: Run tests with pytest
+        run: uv run pytest