How to import an image in lxc 2.1.1

Hi,
Would appreciate if anyone can help me with importing an image into lxc 2.1.1 ?
I have the exported image files as
(1) requirement, image 1, no compression e.g
cadef1e369c73bcbe8f43628fd7cdb4b8652d22a417cb5393641a55392aad8e2.squashfs, meta-cadef1e369c73bcbe8f43628fd7cdb4b8652d22a417cb5393641a55392aad8e2.tar
(2) requirement, image 2: no compression file , e.g: 5499fd91a141c90ec8f51ef11d0ae69d5c4bc56909046856cfc04f10a69239b5.tar
(3) requirement, image 3: bzip2 file , e.g:
c8a4d93e89e328cc1de1a4f9151b1db8bbee8a7d193c900a876dbb7534d8b7a7.tar.bzip2
Regards.

These are all alpine based images, working on openwrt 4.19.101 , for the first one I am getting the following error:
coomand:
lxc-create -t alpine -n imp-alpine cadef1e369c73bcbe8f43628fd7cdb4b8652d22a417cb5393641a55392aad8e2.squashfs meta-cadef1e369c73bcbe8f43628fd7cdb4b8652d22a417cb5393641a55392aad8e2.tar.xz

Obtaining an exclusive lock… done

==> Fetching and/or verifying APK keys
alpine-devel@lists.alpinelinux.org-4a6a0840.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-4d07755e.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-5243ef4b.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-524d27bb.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-5261cecb.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-58199dcc.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-58cbb476.rsa.pub: FAILED
alpine-devel@lists.alpinelinux.org-58e4f17d.rsa.pub: FAILED