Merge branch 'main' into perf_refactor

Author: zulinx86

tests/README.md

@@ -198,7 +198,7 @@ branch and the `HEAD` of your current branch, run
 ```sh
 tools/devtool -y build --rev main --release
 tools/devtool -y build --rev HEAD --release
-tools/devtool -y test --ab -- run build/main build/HEAD --test integration_tests/performance/test_boottime.py::test_boottime
+tools/devtool -y test --no-build --ab -- run build/main build/HEAD --test integration_tests/performance/test_boottime.py::test_boottime
 ```
 
 #### How to Write an A/B-Compatible Test and Common Pitfalls

tools/devtool

@@ -723,6 +723,7 @@ cmd_test() {
       cmd_build --release
       if [ -n "$BUILDKITE_PULL_REQUEST_BASE_BRANCH" ]; then
         cmd_build --release --rev "$BUILDKITE_PULL_REQUEST_BASE_BRANCH"
+        ok_or_die "Failed to build Firecracker!"
       fi
     fi