Try fix gitlab-ci not finding system libs.

.gitlab-ci.yml

@@ -27,6 +27,7 @@ variables:
   script:
   - 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
   - R -e 'devtools::install_deps(dep = T, lib = Sys.getenv("R_LIBS"))'
   - R -e 'devtools::check(check_dir = Sys.getenv("CHECK_DIR"))'