.gitignore: don't track any more public keys or build logs

Signed-off-by: Paul Campbell <pcampbell@kemitix.net>
my-data: create a persistent /root home drive

Copies in the building user's public key so that they can access any
container it is added to.

Signed-off-by: Paul Campbell <pcampbell@kemitix.net>
xterm: sample command launcher

Signed-off-by: Paul Campbell <pcampbell@kemitix.net>
Merge branch 'feature/my-data' into develop