Add some SSH keys to tc-mac workers

etc/taskcluster/macos/modules/pillar/ssh_keys.py

@@ -0,0 +1,14 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import urllib
+
+
+def ext_pillar(_minion_id, _pillar, *_args):
+    url = "https://raw.githubusercontent.com/servo/saltfs/master/admin/files/ssh/%s.pub"
+    return {"ssh_keys": [urllib.urlopen(url % name).read() for name in [
+        "jdm",
+        "manishearth",
+        "simonsapin",
+    ]]}