Initial draft of plugin.

Dockerfile

@@ -0,0 +1,37 @@
+##
+## Debian base layer with python
+##
+
+# hadolint global ignore=DL3008
+FROM docker.io/library/debian:12.11-slim@sha256:e5865e6858dacc255bead044a7f2d0ad8c362433cfaa5acefb670c1edf54dfef AS debian
+RUN rm -rf /etc/*- /tmp/* /var/cache/* /var/log/* /var/lib/dpkg/*-old /var/lib/dpkg/status
+RUN --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
+	apt-get -qq update && \
+	apt-get -qq install --yes --no-install-recommends python3-minimal libpython3-stdlib && \
+	rm -rf /etc/*- /var/lib/dpkg/*-old /var/lib/dpkg/status /var/cache/* /var/log/*
+
+##
+## Download yamllint
+##
+
+FROM debian AS build
+RUN --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
+	apt-get -qq update && \
+	apt-get -qq install --yes --no-install-recommends python3-pip && \
+	rm -rf /etc/*- /var/lib/dpkg/*-old /var/lib/dpkg/status /var/cache/* /var/log/*
+RUN pip install yamllint==v1.37.1 \
+		--root=/build \
+		--root-user-action=ignore \
+		--break-system-packages \
+		--no-cache-dir \
+		--no-warn-script-location
+
+##
+## Final stage
+##
+
+FROM debian
+COPY --link --chown=0:0 --from=build /build /
+COPY --link --chown=0:0 --chmod=555 entrypoint.sh /usr/local/bin/entrypoint.sh
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+USER 1000:1000