[build] add ctseg to docker images for testing

Author: the-hampel

Docker/github_ci_dockerfile

@@ -103,6 +103,12 @@ RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/cthyb
     && cmake ../ \
     && make -j$NCORES && ctest -j$NCORES && make install
 
+# ctseg
+RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/ctseg.git \
+    && cd ctseg && mkdir -p build && cd build \
+    && cmake ../ \
+    && make -j$NCORES && ctest -j$NCORES && make install
+
 # hubbardI
 RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/hubbardI.git \
     && cd hubbardI && mkdir -p build && cd build \

Docker/openmpi_dockerfile

@@ -187,6 +187,12 @@ RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/cthyb
     && cmake ../cthyb.src \
     && make -j$NCORES && ctest -j$NCORES && make install
 
+# ctseg
+RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/ctseg.git ctseg.src \
+    && mkdir -p ctseg.build && cd ctseg.build \
+    && cmake ../ctseg.src \
+    && make -j$NCORES && ctest -j$NCORES && make install
+
 # maxent
 RUN cd /source && git clone -b unstable --depth 1 https://github.com/TRIQS/maxent.git maxent.src \
     && mkdir -p maxent.build && cd maxent.build \