Switch to wheezy and add backports
Add make and bzip2 to development packages
Fix dropbear options for wheezy compatibility

dropbear included in wheezy is an older version that doesn’t support -R option.

Also added -w to disable remote root.
Add wget, libpcre3 packages. Update jq

jq now installs using slashpackage

libpcre3 is needed for grep -P functionality in wheezy.

wget is needed for slashpackage scripts.
Update built dockerfiles