[Merge] ~toabctl/livecd-rootfs:master-replace-apt-key-lp#1948929 into livecd-rootfs:ubuntu/master

[Thomas Bechtold]

Thomas Bechtold has proposed merging ~toabctl/livecd-rootfs:master-replace-apt-key-lp#1948929 into livecd-rootfs:ubuntu/master.

Commit message:
Drop apt-key usage because the tool is deprecated (LP: #1948929)


Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1948929 in livecd-rootfs (Ubuntu): "Stop using apt-key - the tool is deprectated"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1948929

For more details, see:
https://code.launchpad.net/~toabctl/livecd-rootfs/+git/livecd-rootfs-1/+merge/410866
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~toabctl/livecd-rootfs:master-replace-apt-key-lp#1948929 into livecd-rootfs:ubuntu/master.
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