Add gitlab ci test

Change-Id: If4078b90950a4bf9379c6eb2bc63d90a2aa8a208
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..48658fa
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,25 @@
+# use the tidyverse rocker image, as it contains devtools preinstalled
+image: rocker/tidyverse
+
+# define stages of runner. at the moment,
+# just test and build (no deploy).
+stages:
+  - test
+  - build
+
+# define test job
+test-job:
+  stage: test
+  script:
+    # run the R CMD check on the package (this path)
+    - R CMD BUILD . && R CMD CHECK $(ls -t . | head -n1)
+    # run the devtools test
+    # - R -e 'devtools::test()'
+
+build-job:
+  stage: build
+  before_script:
+    - apt-get update && apt-get install -y build-essential libglpk40 libxt6
+  script:
+    # install
+    - R -e 'devtools::install()'