add jenkins user in docker so that ssh will work

automation/Dockerfile

@@ -19,4 +19,7 @@ RUN git clone https://github.com/ETLCPP/etl.git && \
         cd etl && \
         git checkout 20.28.0 && \
         cmake -B build . && \
-        cmake --install build/
+        cmake --install build/
+
+#ssh needs a valid user to work
+RUN adduser -m -u 114 jenkins