* feat: job scaffolding
- Local jobs use a directory rather than filename
This sets up for upcoming scaffolding to use as a space for job
scaffolding code.
- Places all jobs within a 'runs' directory in ./func rather than
'instances' to further differentiate between an instance and a local
run task invoked via .Run
- Updates Jobs' stop handler to have an error return.
- Adds tests which ensure creating and stopping a job are reflected in
the client's .Instances().Local() accessor.
- Adds verbose logging support to the Job implementation.
- Adds a cleanup task which will remove orphaned jobs by, in addition to
previous logic, checking that there is no longer a process listening
on the port indicated by the job.
* fix spelling errors
* fix lint errors
* log job stop errors
* use temp dir for tests
* add back docker build tags and wait
Matej Vasek