Added more CI jobs

Author: astrofrog

.github/workflows/main.yml

@@ -17,7 +17,11 @@ jobs:
         - linux: demoa-explicit
         - linux: demoa-extra
         - linux: demoa-minimal
+        - linux: demoa-empty
+        - linux: demoa-double
         - linux: demob-noextra
         - linux: demob-explicit
         - linux: demob-extra
         - linux: demob-minimal
+        - linux: demob-empty
+        - linux: demob-double