Needed in Buildah (and potentially Podman later on) where some options
must be overridden. Ultimately this should be avoided whenever possible
but this is not my goal at the present.
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
Commit 395ba05c44 implemented a POC to allow for changing the behavior
when loading multiple container.conf files in sequence. By default, the
TOML encoder will override existing data/fields with the one specified
in the loaded file. The POC has demonstrated how this behavior can be
changed to append string slices instead of overriding/replacing them
entirely.
This change is the first step of integrating these appendable string
arrays into containers.conf and starts with enabling the `Env`,
`Mounts`, and `Volumes` fields in the `[Containers]` table.
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>