Add cppcheck and slepc in docker image

.gitlab/Dockerfile

@@ -8,7 +8,7 @@ RUN apt-get -y upgrade --no-install-recommends \
     # linux base packages
     bash ca-certificates cpio sudo vim wget \
     # dev tools
-    bison flex git pkg-config python-is-python3 \
+    bison cppcheck flex git pkg-config python-is-python3 \
     # C/Fortran compiling tools
     build-essential cmake cmake-data cmake-curses-gui gfortran
 
@@ -30,7 +30,8 @@ RUN apt-get -y upgrade --no-install-recommends \
     libsimgrid-dev \
     libstarpu-dev \
     libsuitesparse-dev \
-    petsc-dev
+    petsc-dev \
+    slepc-dev
 
 RUN apt-get autoremove -y
 RUN apt-get autoclean -y