Merge branch 'danger-nocache' into 'develop'

GitLab CI: don't cache danger job, switch to npx

See merge request soapbox-pub/soapbox-fe!1537

.gitlab-ci.yml

@@ -24,7 +24,8 @@ deps:
 
 danger:
   stage: test
-  script: yarn danger ci
+  script: npx danger ci
+  cache: []
   only:
     - merge_requests