Remove auto push to docker hub in actions

[MinsukJi-NOAA]

The auto push to docker hub in actions workflow will be removed for the following reasons:

• It appears that pull requests initiated by developers do not have permission to access secrets required to push to docker hub in actions
• It's not a good idea to push to docker hub every time a PR is made.

One issue for this removal is how to maintain the docker hub images up to date with the changes in this repository. This will be addressed separately.

[aerorahul]

I reverted the pr #10 since it failed the CI.

[MinsukJi-NOAA]

Thanks. It seems that the error stems from trying to get the udunits.tar.gz. I will update the PR.