Add gitlab ci workflow

Mainly to check if the installation on ubuntu rolling works.

Change-Id: I19f7fd847fdeaf4c683a40b6f240cde211913779
diff --git a/ci/Makevars b/ci/Makevars
new file mode 100644
index 0000000..1292033
--- /dev/null
+++ b/ci/Makevars
@@ -0,0 +1,11 @@
+VER=
+CXX17=$(CCACHE) g++$(VER)
+CCACHE=ccache
+#CCACHE=
+CC=$(CCACHE) gcc$(VER)
+CXX=$(CCACHE) g++$(VER)
+CXX11=$(CCACHE) g++$(VER)
+CXX14=$(CCACHE) g++$(VER)
+CXX17=$(CCACHE) g++$(VER)
+FC=$(CCACHE) gfortran$(VER)
+F77=$(CCACHE) gfortran$(VER)