[excalidraw] Run yarn once first

ansible/roles/excalidraw/tasks/main.yml

@@ -24,7 +24,7 @@
 - name: Yarn dependencies installed
   shell:
     chdir: /usr/local/src/excalidraw
-    cmd: yarn build
+    cmd: yarn && yarn build
 
 - name: Excalidraw build artifacts installed
   shell: