Bug 1388431 - [win32/64, macosx64] Devedition: mars should be signed with Nightly key r=Callek

MozReview-Commit-ID: LEJ1OsZNSm9

taskcluster/taskgraph/util/scriptworker.py

@@ -419,3 +419,16 @@ def get_release_config(config):
             version = fh.readline().rstrip()
         release_config['version'] = version
     return release_config
+
+
+def get_signing_cert_scope_per_platform(build_platform, is_nightly, config):
+    if build_platform in (
+        'linux-devedition-nightly', 'linux64-devedition-nightly',
+        'macosx64-devedition-nightly',
+        'win32-devedition-nightly', 'win64-devedition-nightly',
+    ):
+        return get_devedition_signing_cert_scope(config)
+    elif is_nightly:
+        return get_signing_cert_scope(config)
+    else:
+        return 'project:releng:signing:cert:dep-signing'