Move UI tests before docker image build to reduce time-to-failure

.github/workflows/pull_requests.yml

@@ -37,7 +37,14 @@ jobs:
         if: success()
         run: npx grunt prod
 
+      - name: UI Tests
+        if: success()
+        run: |
+          sudo apt-get install xvfb
+          xvfb-run --server-args="-screen 0 1200x800x24" npx grunt testui
+
       - name: Set up Docker Buildx
+        if: success()
         uses: docker/setup-buildx-action@v3
 
       - name: Set up QEMU
@@ -49,8 +56,3 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm64
-      - name: UI Tests
-        if: success()
-        run: |
-          sudo apt-get install xvfb
-          xvfb-run --server-args="-screen 0 1200x800x24" npx grunt testui