ci: shard the aio example e2e tests

.travis.yml

@@ -55,7 +55,8 @@ env:
     - CI_MODE=browserstack_optional
     - CI_MODE=docs_test
     - CI_MODE=aio
-    - CI_MODE=aio_e2e
+    - CI_MODE=aio_e2e AIO_SHARD=0
+    - CI_MODE=aio_e2e AIO_SHARD=1
     - CI_MODE=bazel
 
 matrix:
@@ -63,7 +64,6 @@ matrix:
   allow_failures:
     - env: "CI_MODE=saucelabs_optional"
     - env: "CI_MODE=browserstack_optional"
-    - env: "CI_MODE=aio_e2e"
 
 before_install:
   # source the env.sh script so that the exported variables are available to other scripts later on

scripts/ci/test-aio-e2e.sh

@@ -13,6 +13,6 @@ source ${thisDir}/_travis-fold.sh
 
   # Run example e2e tests
   travisFoldStart "test.aio.example-e2e"
-    yarn example-e2e -- --setup
+    yarn example-e2e -- --setup --shard=${AIO_SHARD}/2
   travisFoldEnd "test.aio.example-e2e"
 )