dockerfile.spack-gmds: added lcov system package installation

dockerfiles/Dockerfile.spack-gmds

@@ -18,7 +18,7 @@ ENV TZ=Europe/Paris
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 #==========================================
 RUN apt update &&\
-    apt install -y build-essential cmake python3 python3-venv pip unzip zip curl git autoconf wget &&\
+    apt install -y build-essential cmake python3 python3-venv pip unzip zip curl git autoconf wget lcov &&\
     apt clean &&\
     rm -rf /var/lib/apt/lists/*
 #==========================================