add note about PR galaxyproject/ansible-cvmfs#32

inventory/group_vars/all.yml

@@ -37,6 +37,8 @@ eessi_cvmfs_keys:
      HJN0HHOVdRIwNjjPkV2jIqhJoI85no89v8/V45SFPVo+A7N0Cj4QdQrQTezpnlby
      FQIDAQAB
      -----END PUBLIC KEY-----
+  # The following (duplicate) key can be removed after this PR has been merged:
+  # https://github.com/galaxyproject/ansible-cvmfs/pull/32
   - path: /etc/cvmfs/keys/eessi-hpc.org/ci.eessi-hpc.org.pub
     key: |
      -----BEGIN PUBLIC KEY-----