[cppget] Repository is now signed

[Boris Kolpackov]

Hi,

All the cppget.org repositories are now signed to prevent tampering with
packages. The repository certificate subject and SHA256 fingerprint are
as follows:

CN=cppget.org/O=Code Synthesis/admin at cppget.org
86:BA:D4:DE:2C:87:1A:EE:38:C7:F1:64:7F:65:77:02:15:79:F3:C4:83:C0:AB:5A:EA:F4:F7:8C:1D:63:30:C6

Please save the fingerprint so that you can use it later to authenticate
cppget.org repositories.

This information as well as the entire certificate are also displayed on
the repository's about page. For more information on repository signing
see the bpkg-repository-signing(1) help topic:

https://build2.org/bpkg/doc/bpkg-repository-signing.xhtml

Enjoy,
	Boris