Announce: Flatpak 1.5.2

[Alexander Larsson]

Available here:
 https://github.com/flatpak/flatpak/releases/tag/1.5.2

$ sha256sum flatpak-1.5.2.tar.xz
6333a0c88005cfff96d896a6907dca365b761eac833ec40eb2640a420e609cd3
flatpak-1.5.2.tar.xz

This version has further changes to the protocol and API for handing
authentication, in order to make it more flexible and futureproof. The
sample authenticator has been updated to the new APIs. Flatpak now
ships with a OCI authenticator that can be used to access private OCI
registries.

FlatpakTransaction now also has a callback for simple user/password
authentication for an authenticator (the basic-auth-start signal)
modeled on HTTP basic authentication. This is handled in the flatpak
CLI by interactive prompts on the terminal. This is needed by the OCI
authenticator, but can also be used by other authenticators that have
simple authentication requirements.

There were also some fixes to the new self-sandboxing support of the
flatpak spawn portal, allowing webkit to use it.

Other changes:
 * Show background status in flatpak ps
 * Improved docs and help output
 * Fix support for fd forwarding and the allow_a11y flag in the
sandboxing portal
 * Some improvements to the new permission-set command
 * New remote option that allows settting the default token type
(mostly for debugging)


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 Alexander Larsson                                Red Hat, Inc
       alexl at redhat.com         alexander.larsson at gmail.com