Add post on signing disruption

Author: the-maldridge

_posts/2021-07-17-signing-disruption.markdown

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+---
+title: Repository Signing Disruption
+layout: post
+---
+
+We are aware of an ongoing infrastructure issue affecting repository
+synchronization and package signing.  We are working to resolve this
+disruption, but first must resolve another unrelated infrastructure
+issue.  We have no short term ETA for service restoration, however our
+worst case resolution timeline is Friday the 23rd of July.
+
+Your patience is appreciated while we perform this work as fast as
+possible.