Override hostname for container

Adds the ability to override the container's hostname.  Also, uses
the first twelve characters of the container ID as the default hostname
if none is provided.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #248
Approved by: baude
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f