CI system dependency on libglpk-dev for geonetwork.

Affects test-release, which uses RStudio Package Manager for R-packages.
test-devel install packages from source and while libglpk-dev is not installed, the dependency is satisfied somehow.

.gitlab-ci.yml

@@ -28,7 +28,7 @@ variables:
   - mkdir -p $R_LIBS $BUILD_LOGS_DIR
   # system requirements
   - apt-get update -qq
-  - apt-get install -y --no-install-recommends libv8-dev libjq-dev libprotobuf-dev protobuf-compiler qpdf libgdal-dev libproj-dev libudunits2-dev
+  - apt-get install -y --no-install-recommends libv8-dev libjq-dev libprotobuf-dev protobuf-compiler qpdf libgdal-dev libproj-dev libudunits2-dev libglpk-dev
   - R -e 'devtools::install_deps(dep = T, lib = Sys.getenv("R_LIBS"))'
   - R -e 'devtools::check(check_dir = Sys.getenv("CHECK_DIR"))'
   - R -e 'if (length(devtools::check_failures(path = Sys.getenv("BUILD_LOGS_DIR"), note = FALSE)) > 0) stop()'