test: build all non-main modules for mobile (#1036)

Ensure that we don't break the build for mobile by doing a `go build`
for all of the non-main modules in the repo. Should hopefully catch
issues like #1035 sooner.

.github/workflows/test.yml

@@ -37,6 +37,9 @@ jobs:
     - name: End 2 end
       run: make e2evv
 
+    - name: Build test mobile
+      run: make build-test-mobile
+
     - uses: actions/upload-artifact@v3
       with:
         name: e2e packet flow