add some dagster files

dagster/Dockerfile.system

@@ -0,0 +1,18 @@
+# Dagster libraries to run both dagit and the dagster-daemon. Does not
+# need to have access to any pipeline code.
+
+FROM python:3.12-slim
+
+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 mkdir -p $DAGSTER_HOME
+
+COPY dagster.yaml workspace.yaml $DAGSTER_HOME
+
+WORKDIR $DAGSTER_HOME