dockerize and add CI workflow

.github/workflows/build.yaml

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+name: Build docker image
+
+on:
+  push
+
+jobs:
+  runs:
+    runs-on: ubuntu-24.04
+    permissions:
+      packages: write
+    steps:
+      - name: Log in to Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build image
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: gtfs2netex:latest

Dockerfile

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+FROM python:3.13-alpine
+WORKDIR /app
+COPY requirements.txt .
+COPY *.py .
+RUN pip install -r requirements.txt
+ENTRYPOINT ["python", "GTFS2NeTEx-converter.py"]

requirements.txt

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+haversine==2.9.0
+numpy==2.2.0
+pandas==2.2.3
+python-dateutil==2.9.0.post0
+pytz==2024.2
+six==1.17.0
+tzdata==2024.2