feat: run vue-tsc in ci (#1295)

We had this in for a while already, but never cared for the result.
Might make sense to integrate in the pipeline.

To make things easy from the start we could add [`failure: ignore`](https://docs.drone.io/pipeline/macstadium/syntax/steps/#failure) to the step

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1295
Reviewed-by: konrad <k@knt.li>
Co-authored-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>
Co-committed-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>

.drone.yml

@@ -98,6 +98,15 @@ steps:
     depends_on:
       - dependencies
 
+  - name: typecheck
+    failure: ignore
+    image: node:16
+    pull: true
+    commands:
+      - yarn typecheck
+    depends_on:
+      - dependencies
+
   - name: test-frontend
     image: cypress/browsers:node16.5.0-chrome94-ff93
     pull: true