Make the web app work offline and update itself (#239)

.github/workflows/ci.yml

@@ -100,6 +100,8 @@ jobs:
         run: cargo xtask licences --check
       - name: Dependency layers
         run: cargo xtask layers
+      - name: Web app offline use and updates (headless Chrome)
+        run: cargo xtask web-offline-test
 
   clippy:
     name: Native Linux Clippy

.github/workflows/pages.yml

@@ -50,6 +50,8 @@ jobs:
       - name: Build the web app
         working-directory: apps/solidcraft-web
         run: trunk build --release --public-url /solidcraft/app/
+      - name: Test the web app offline and across an update (headless Chrome)
+        run: cargo xtask web-offline-test --site dist/web
       - name: Assemble the site
         run: |
           mkdir -p site