[CI] add lib dependencies

.gitlab-ci.yml

@@ -26,7 +26,12 @@ cache:
 
 before_script:
   - apt-get update
-
+  - apt-get install --yes libcurl4-openssl-dev # required for installing R package "curl"
+  - apt-get install --yes libgit2-dev # required for R package "git2r"
+  - apt-get install --yes libssl-dev # required for R packages "git2r" and "openssl"
+  - apt-get install --yes libssh2-1-dev # required for R package "git2r"
+  - apt-get install --yes libxml2-dev # required for R package "xml2"
+    
 install_dependencies:
   stage: dependencies
   script: