Add more examples to CI

Some of the examples had not been added to the CI. This means that they
can break silently if the API changes. This change makes it more obvious
if they are broken.

I've left out the multi-window example since that was broken recently.

.github/workflows/ci.yml

@@ -77,10 +77,16 @@ jobs:
       fail-fast: false
       matrix:
         examples:
+          - "applet"
           - "application"
-          - "open-dialog"
+          - "calendar"
+          - "config"
           - "context-menu"
+          - "image-button"
+          - "menu"
           - "nav-context"
+          - "open-dialog"
+          - "text-input"
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources