Add SRA too

Dockerfile

@@ -21,6 +21,20 @@ RUN apt-get update && \
     apt-get clean && \
     rm /tmp/${JRE_DEB} /tmp/${INSEL_DEB}
 
+# SRA (Simplified Radiosity Algorithm, used by shadow-processing workflow steps) is a
+# separate ~550KB binary+library, not bundled in the SimStadt zip itself. Cheap enough to
+# always include, even though the current test suite's shadow-processing integration tests
+# already pass without it (SimStadt appears to fall back to a pure-Java path when absent).
+# citysim_sra links against libGLU at runtime, hence libglu1-mesa below (small: ~1MB installed).
+RUN apt-get update && \
+    apt-get install libglu1-mesa --no-install-recommends -y && \
+    rm -rf /var/lib/apt/lists/* && \
+    apt-get clean
+ADD https://simstadt.hft-stuttgart.de/download/InstallFiles/citysim_sra /usr/local/bin/
+RUN chmod a+rx /usr/local/bin/citysim_sra
+ADD https://simstadt.hft-stuttgart.de/download/InstallFiles/libshortwave.so /usr/lib/
+RUN chmod a+r /usr/lib/libshortwave.so
+
 RUN groupadd -g 1000 simstadt \
   && useradd simstadt --create-home --shell /bin/bash -u 1000 -g 1000