[RUN-3153] accept RUNTIME_BUILD_ID as an environment variable before …

…pulling it from buildkite (#10330)

This should let us run devtools tests on any devtools branch/commit against any runtime build.


see https://linear.app/replay/issue/RUN-3153/buildkite-allow-easily-changing-devtools-versions-in-buildkite-runtime

packages/e2e-tests/scripts/buildkite_run_fe_tests_from_artifact.ts

@@ -7,7 +7,10 @@ import run_fe_tests from "./buildkite_run_fe_tests";
 export default function run_fe_tests_from_artifact(PLATFORM, ARCH) {
   console.group("BUILD PREP");
   console.time("BUILD PREP");
-  let RUNTIME_BUILD_ID = build_id_from_artifact(PLATFORM, ARCH);
+  let RUNTIME_BUILD_ID = process.env.RUNTIME_BUILD_ID;
+  if (!RUNTIME_BUILD_ID) {
+    RUNTIME_BUILD_ID = build_id_from_artifact(PLATFORM, ARCH);
+  }
   let CHROME_BINARY_PATH = install_build_products(RUNTIME_BUILD_ID, PLATFORM, ARCH);
   console.timeEnd("BUILD PREP");
   console.groupEnd();