fix(ci): Install webkit2gtk on ubuntu when building smoke tests via prod (#188)

.github/workflows/build-smoke-tests.yml

@@ -28,6 +28,11 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
           toolchain: stable
+    - name: install webkit2gtk (ubuntu only)
+      if: matrix.platform == 'ubuntu-latest'
+      run: |
+           sudo apt-get update
+           sudo apt-get install -y webkit2gtk-4.0
     - name: cache rust bin
       id: cache_rust_bin
       uses: actions/cache@v1