Include npm_build job for bors and mergify

Author: thomaseizinger

.mergify.yml

@@ -6,6 +6,7 @@ pull_request_rules:
       - "status-success=build (windows)"
       - "status-success=build (ubuntu)"
       - "status-success=e2e_test"
+      - "status-success=npm_build"
       - "status-success=license/cla"
       - "author:dependabot-preview[bot]"
     actions:
@@ -20,6 +21,7 @@ pull_request_rules:
       - "status-success=build (windows)"
       - "status-success=build (ubuntu)"
       - "status-success=e2e_test"
+      - "status-success=npm_build"
       - "status-success=license/cla"
       - -conflict
       - label!=work-in-progress

bors.toml

@@ -4,5 +4,6 @@ status = [
     "build (ubuntu)",
     "build (windows)",
     "e2e_test",
+    "npm_build",
 ]
 pr_status = ["license/cla"]