Add tests

.gitlab-ci.yml

@@ -3,6 +3,12 @@ image: node:18.14.0
 stages:
   - test
 
+# === Caches ===
+.yarn-cache: &yarn-cache
+  key: yarn-$CI_JOB_IMAGE
+  paths:
+    - .yarn
+
 # === Proxy ===
 # Description: sets up the proxy needed for the runner inside of the PTB. Produces a build.env that is used in the next jobs
 proxy: