Add option to specify level-1 dir destination

[adybbroe]

This PR adds an option to specify the name of the level-1directory path.

[adybbroe]

I failed to get the mounting to work properly when invoking podman run so I am linking a "volume" instead like this:
podman run --rm -v /san1/polar_in/direct_readout/aws:/data/aws:Z r-harbor.smhi.se/satsa/aws-processors

This means /data/aws in the container should correspond to how data are structured in the host under /san1/polar_in/direct_readout/awsand thus I would like to have contrl over the naming of the level-1 dir. Hence this PR.

[pnuu]

You can mount the correct directory directly with -v just by giving the full path keeping the code simpler. I noticed that SELinux doesn't allow bind mounts and added similar mount commands to the READMEs of my two PRs.

[pnuu]

Like this:

    podman run \
    -v /tmp/raw:/data/raw:Z \
    -v /tmp/L1:/data/L1:Z \
    --rm \
    localhost/aws_pre_proc

[pnuu]

And to clarify, in your case you can do, assuming the raw and L1 are the directories on your host:

podman run --rm \
    -v /san1/polar_in/direct_readout/aws/raw:/data/raw:Z \
    -v /san1/polar_in/direct_readout/aws/L1:/data/L1:Z \
    r-harbor.smhi.se/satsa/aws-processors

This way we don't need to make the code unnecessarily more complicated.