feat: Dockerfile with skopeo for image mirroring

Dockerfile

@@ -0,0 +1,13 @@
+FROM python:3.12-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    skopeo \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY check_versions.py .
+
+CMD ["python", "check_versions.py"]