Added Docker support (#40)

* Added Docker support

- replaced necessity for devicemapper (through kpartx) by using parted and
  losetup with offsets
- added Dockerfile
- added dependency for parted and grep
- added hints to README.md
- common: loop through unmounts, fix shellcheck warnings

* stage2: use debconf instead of console-setup patch. Fixes #41 

1 files changed, 5 insertions, 1 deletions

diff --git a/depends b/depends
index a4c48cd..c453281 100644
--- a/depends
+++ b/depends
@@ -1,8 +1,12 @@
 quilt
+parted
+realpath
 qemu-arm-static:qemu-user-static
 debootstrap
-kpartx zerofree
+zerofree
 pxz zip
 mkdosfs:dosfstools
 capsh:libcap2-bin
 bsdtar
+grep
+rsync
\ No newline at end of file