switch to on-push building

Dockerfile

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+# use python 3.12 as a base image
+FROM docker.io/python:3.13-alpine
+# use the latest version of uv, independently of the python version
+COPY --from=ghcr.io/astral-sh/uv:0.8.15 /uv /uvx /bin/
+
+WORKDIR /app
+
+# copy the requirements and install them
+COPY pyproject.toml uv.lock .
+RUN uv sync --frozen
+
+# copy the rest of the code
+COPY config.yaml .
+COPY config .
+
+CMD ["uv", "run", "octodns", "--config-file", "config.yaml", "--doit"]