Document changes and release 5.12.0~rc5pureos1~amber1 of linux-next-librem5

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
2 jobs for pureos/5.12.0_rc5pureos1_amber1 in 63 minutes and 54 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #337862
librem5
build:aarch64

00:32:20

passed #337863
librem5:arm64
build:deb

01:03:54