refactor(@angular/build): allow Bazel to inject a custom esbuild plugin#31598

clydin merged 1 commit intoangular:20.3.xangular/angular-cli:20.3.xfrom

clydin:bazel-esbuild-env-var-20.3.xclydin/angular-cli:bazel-esbuild-env-var-20.3.xCopy head branch name to clipboard