keys: add build.postmarketos.org.rsa.pub (!1829)

The public key for the new binary repository. Once we can build all
packages with that (for all arches), we'll switch to it.

See also: https://gitlab.com/postmarketOS/build.postmarketos.org/

pmb/data/keys/build.postmarketos.org.rsa.pub

@@ -0,0 +1,14 @@
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----

test/test_keys.py

@@ -73,7 +73,7 @@ def test_keys(args):
         assert filecmp.cmp(mirror_path, original_path, False)
 
     # Find postmarketOS keys
-    keys_pmos = ["pmos-5a03a13a.rsa.pub"]
+    keys_pmos = ["pmos-5a03a13a.rsa.pub", "build.postmarketos.org.rsa.pub"]
     for key in keys_pmos:
         assert os.path.exists(mirror_path_keys + "/" + key)