ci: point the desktop app at the test directory and restore the smoke test's searches

With the test backend, the app is built against the test directory's address, and the smoke test runs a new search case: after the backend case's checks, in both layouts, "Search in Directory" and the full search with a SimpleX name, and with the toolbar at the bottom the full search in the New chat sheet.

.github/workflows/desktop-linux.yml

@@ -274,6 +274,15 @@ jobs:
         timeout-minutes: 30
         run: scripts/ci/desktop-linux/backend.sh start ~/backend/${{ env.BACKEND_PKG }} "$RUNNER_TEMP/backend"
 
+      - name: Point the app at the test directory
+        id: link
+        if: steps.backend.outcome == 'success'
+        run: |
+          link=$(cat "$RUNNER_TEMP/backend/directory-link")
+          file=apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/DirectorySearch.kt
+          sed -i "s|^const val DIRECTORY_SERVICE_LINK = \".*\"$|const val DIRECTORY_SERVICE_LINK = \"$link\"|" "$file"
+          grep -F "const val DIRECTORY_SERVICE_LINK = \"$link\"" "$file"
+
       # the app and its tests are still built when the backend fails
       - name: Setup Java
         if: ${{ !cancelled() && steps.core.outcome == 'success' }}
@@ -304,13 +313,13 @@ jobs:
         run: scripts/ci/desktop-linux/test-summary.py apps/multiplatform/common/build/test-results/desktopTest
 
       - name: Run smoke test
-        if: ${{ !cancelled() && steps.build.outcome == 'success' && steps.backend.outcome != 'failure' }}
+        if: ${{ !cancelled() && steps.build.outcome == 'success' && steps.backend.outcome != 'failure' && steps.link.outcome != 'failure' }}
         env:
           BACKEND: ${{ steps.backend.outcome }}
         run: |
           if [ "$BACKEND" = success ]; then
             export NAMES_SERVER=$(cat "$RUNNER_TEMP/backend/names-server")
-            cases=backend
+            cases=search
           fi
           scripts/ci/desktop-linux/smoke-test.sh apps/multiplatform/release/main/app/simplex "$RUNNER_TEMP/smoke-test" ${cases:-}