luks builds are failing, see Image Build [Image Builds] [Jenkins]
looking into the build logs of these builds show
ERROR: command failed: ['cryptsetup', 'luksClose', '/dev/mapper/crypt_root']
Device /dev/mapper/crypt_root is still in use.
Creating disk image
Creating partitions
Using bootoffset: 5mib 5242880 bytes
Using bootsize 493mib: 512000000 bytes
EEEK! Something bad happened...
command failed: ['cryptsetup', 'luksOpen', '--key-file', 'passphrase.txt', u'/dev/mapper/loop37p2', 'crypt_root']
Device crypt_root already exists.
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By default librem5-flash-image script downloads the luks variant, so try the plain variant.