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76a4fdc358
This `--config` option was initially added here:
4e4c3e3dbf
Under the hood this simply modifies env to set DOCKER_CONFIG=<passed
in string>
The DOCKER_CONFIG env var is used as a directory that contains
multiple config files... of which podman and container libs probably
only use `$DIR/config.json`.
See: https://docs.docker.com/reference/cli/docker/#environment-variables
The old CMD and help text was misleading... if we point the at a
regular file we can see errors like:
```
$ touch /tmp/foo/tmpcr9zrx71
$ /bin/podman --config /tmp/foo/tmpcr9zrx71 build -t foobar:latest
Error: creating build container: initializing source docker://quay.io/centos/centos:stream9: getting username and password: reading JSON file "/tmp/foo/tmpcr9zrx71/config.json": open /tmp/foo/tmpcr9zrx71/config.json: not a directory
```
^^ In this case we had created `/tmp/foo/tmpcr9zrx71` as a regular file.
Signed-off-by: Ian Page Hands <iphands@gmail.com>