Merge branch 'sysimage-v3' into 'sysimage-v3'

/tmp might be too small for the full system, so we set a different TMPDIR

See merge request !39

reform2-imx8mq/mkimage.sh

@@ -16,6 +16,9 @@ else
 fi
 export SOURCE_DATE_EPOCH
 
+# /tmp might be too small for the full system, so we set a different TMPDIR
+export TMPDIR="$(pwd)"
+
 # download u-boot from CI
 /usr/lib/apt/apt-helper download-file https://source.mnt.re/reform/reform-boundary-uboot/-/jobs/artifacts/master/raw/flash.bin\?job\=build flash.bin