[build] allow manually rerunning RBE with cache disabled (#15680)

Author: titusfortner

.github/workflows/ci-rbe.yml

@@ -6,6 +6,12 @@ on:
     branches:
       - trunk
   workflow_dispatch:
+    inputs:
+      disable_test_cache:
+        description: 'Force re-run of tests (disable test cache)'
+        required: false
+        default: false
+        type: boolean
 
 jobs:
   format:
@@ -26,4 +32,4 @@ jobs:
       name: All RBE tests
       caching: false
       ruby-version: jruby-9.4.12.0
-      run: ./scripts/github-actions/ci-build.sh
+      run: ./scripts/github-actions/ci-build.sh ${{ github.event.inputs.disable_test_cache }}

scripts/github-actions/ci-build.sh

@@ -4,11 +4,20 @@ set -eufo pipefail
 # We want to see what's going on
 set -x
 
+# Default to auto if no parameter is provided
+CACHE_RESULTS="auto"
+
+# If "disable test cache" is passed in and true
+if [ $# -gt 0 ] && [ "$1" = "true" ]; then
+  CACHE_RESULTS="no"
+fi
+
 # Now run the tests. The engflow build uses pinned browsers
 # so this should be fine
 # shellcheck disable=SC2046
 bazel test --config=rbe-ci --build_tests_only \
   --keep_going --flaky_test_attempts=2 \
+  --cache_test_results=${CACHE_RESULTS} \
   //... -- $(cat .skipped-tests | tr '\n' ' ')
 
 # Build the packages we want to ship to users