improve dockerfiles and adjust code paths

Dockerfile.system

@@ -1,24 +1,25 @@
 FROM python:3.12-slim
 
-# Install envsubst
-RUN apt-get update && apt-get install -y gettext
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
-# Dagster libraries to run both dagit and the dagster-daemon. Does not
-# need to have access to any pipeline code.
+RUN apt-get update \
+    && apt-get install --no-install-recommends --yes \
+       curl gettext \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
+ENV PATH=/root/.local/bin:$PATH
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+
+ENV DAGSTER_HOME=/opt/dagster/home/
+WORKDIR $DAGSTER_HOME
 COPY dagster-requirements.txt requirements.txt
 
-RUN pip install uv
-RUN uv pip install -r requirements.txt --system
-RUN uv pip install polars-lts-cpu --system
-
-# Set $DAGSTER_HOME and copy dagster instance and workspace YAML there
-ENV DAGSTER_HOME=/opt/dagster/home/
+RUN uv pip install -r requirements.txt --system \
+    && uv pip install polars-lts-cpu --system
 
 RUN mkdir -p $DAGSTER_HOME
 
-# COPY dagster.yaml workspace.yaml $DAGSTER_HOME
-
 # Create entrypoint that renders the dagster.yaml from a template
 RUN cat << 'EOF' > /entrypoint.sh
 #!/bin/sh
@@ -33,6 +34,4 @@ EOF
 RUN chmod +x /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
 
-ENV PYTHONPATH=/system:$PYTHONPATH
-
-WORKDIR $DAGSTER_HOME
+ENV PYTHONPATH=/code/system:$PYTHONPATH