Adding cypress.

Makefile

@@ -17,7 +17,7 @@
 # along with the Alpha Centauri Farming project.  If not, see
 # <https://www.gnu.org/licenses/>.
 
-.PHONY: clean install interactive
+.PHONY: clean install interactive cypress
 
 assets := assets/game/acf/
 
@@ -49,6 +49,9 @@ runprod:
 upload:
 	rsync -rtvz dist/ $(SERVER):~/farm
 
+cypress:
+	npm run cypress:open
+
 clean:
 	rm -f *~ res/js/app.js