(ixsnake) uses an std::thread to handle redis subscriptions (2 unittest still failing)

docker/Dockerfile.ubuntu_groovy

@@ -6,8 +6,18 @@ RUN apt-get update
 
 RUN apt-get -y install g++ libssl-dev libz-dev make python ninja-build
 RUN apt-get -y install cmake
+RUN apt-get -y install gdb
 
 COPY . /opt
 WORKDIR /opt
 
+#
+# To use the container interactively for debugging/building
+# 1. Build with
+#    CMD ["ls"]
+# 2. Run with
+#    docker run --entrypoint sh -it docker-game-eng-dev.addsrv.com/ws:9.10.6 
+#
+
 RUN ["make", "test"]
+# CMD ["ls"]