[CI] Hook cli-tests up to CI

Add cli-tests to `make test`. This adds a `python3` dependency to `make
test`, but not `make check`. We could make this dependency optional by
skipping the tests if `python3` is not present.

tests/cli-tests/dictionaries/setup_once

@@ -2,7 +2,7 @@
 
 set -e
 
-source "$COMMON/platform.sh"
+. "$COMMON/platform.sh"
 
 
 mkdir files/ dicts/