build: add postinstall script as runfile for yarn_install repository rule (#44490)

Adds the postinstall script as runfile for the `yarn_install`
repository rule, so that the dependencies are re-fetched when
the script changes.

PR Close #44490

WORKSPACE

@@ -40,6 +40,9 @@ load("//integration:npm_package_archives.bzl", "npm_package_archives")
 
 yarn_install(
     name = "npm",
+    # Note that we add the postinstall script here so that the dependencies are re-installed
+    # when the postinstall patches are modified.
+    data = ["//tools:postinstall-patches.js"],
     manual_build_file_contents = npm_package_archives(),
     package_json = "//:package.json",
     yarn_lock = "//:yarn.lock",

tools/BUILD.bazel

@@ -4,6 +4,7 @@ package(default_visibility = ["//visibility:public"])
 
 exports_files([
     "tsconfig.json",
+    "postinstall-patches.js",
     "jasmine-seed-generator.js",
 ])