Lintian tag information: debian-watch-file-pubkey-file-is-missing (type: error)

Description (from lintian-explain-tags)

This watch file verifies a cryptographic signature but the upstream public
key is missing.

Please add upstream public keys in either debian/upstream/signing-key.asc
or debian/upstream/signing-key.pgp.

Please refer to the uscan(1) manual page for details.

Visibility: error
Show-Always: no
Check: debian/watch

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