* test: add test for networking setup in act
This test makes sure that the hostname inside of act is resolvable.
* fix: only merge existing container options
When merging parsed container options without options being
set in a job, the default docker options are returned and
will override the expected defaults by act (e.g. network mode).
This is a first attempt to mitigate this behavior and only
merge settings if something was requested on a job.
* refactor: split config merging into own function
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
