First docker build environment

First functional version, but it needs some improvements and fixes
identified as I've used it personally on one thing, and when an AI
(Claude) used it to work through the CI test errors.

I had the AI make a SKILL.md file. If the AI indicates it needs to
build the ifcopenshell binary, use this and let it rip.

docker/Dockerfile_update

@@ -0,0 +1,16 @@
+FROM ifcopenshell-build-env:updated
+
+# Update system
+RUN dnf update -y
+
+# Clean the caches
+RUN dnf clean all && \
+    rm -rf /var/cache/dnf
+
+# Setup uv
+COPY --from=ghcr.io/astral-sh/uv:0.11.27 /uv /uvx /bin/
+
+# Install Python
+RUN uv python install
+
+CMD ["sleep", "infinity"]