Add github actions workflow to build docker image

.dockerignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+.eggs/
+dist/
+build/
+*.egg
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Git
+.git/
+.gitignore
+
+# Testing/Coverage
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.nox/
+
+# Misc
+*.log
+*.bak
+.DS_Store

.github/workflows/docker.yml

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+name: Build Docker Image
+
+on:
+  push:
+    branches: [main, master]
+    tags: ['v*']
+  pull_request:
+    branches: [main, master]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    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
+        if: github.event_name != 'pull_request'
+        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=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build test image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          load: true
+          tags: pokewalker-test:latest
+          cache-from: type=gha
+
+      - name: Run tests
+        run: |
+          docker run --rm pokewalker-test:latest pytest -v

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+*.egg
+*.egg-info/
+.eggs/
+dist/
+build/
+wheels/
+pip-wheel-metadata/
+*.manifest
+*.spec
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Testing/Coverage
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+.tox/
+.nox/
+.hypothesis/
+
+# Type checking
+.mypy_cache/
+.pytype/
+
+# Linting
+.ruff_cache/
+
+# Misc
+*.log
+*.bak
+.DS_Store
+Thumbs.db
+
+# EEPROM dumps (may contain personal data)
+*.bin
+!tests/*.bin