use kubectl_jll

[kolia]

kubectl is no longer required to be running in a side-car container

addresses #6

This ends up simplifying a couple of other annoyances:

• no need to pass in an IMAGE env variable; since there is only one container in the pod, we can default to using the driver container's image for workers by passing image=nothing to addprocs_pod.
• if the driver is running as a job, that job will complete on exit only if there are no side-cars.

[ericphanson]

Cool! Questions:

• Should the README be updated?
• should we allow choosing a custom port? Maybe via an environmental variable, since it runs at init time?
• do we need access to that task that gets started?
  • would we need to restart it for some reason?

[kolia]

• Should the README be updated?

Just updated the README. Planning on adding a more fleshed out example (julia_pod) later on.

• should we allow choosing a custom port? Maybe via an environmental variable, since it runs at init time?

• do we need access to that task that gets started?

  • would we need to restart it for some reason?

Can't think why you'd need to use a different port or to restart, kubectl proxy has been pretty sturdy running for me, but it's easy to add so just did....

[codecov-io]

Codecov Report

Merging #10 (bb2c6da) into main (e0758c0) will increase coverage by 4.37%. The diff coverage is 80.00%.

@@           Coverage Diff            @@
##            main     #10      +/-   ##
========================================
+ Coverage   1.17%   5.55%   +4.37%     
========================================
  Files          2       2              
  Lines         85      90       +5     
========================================
+ Hits           1       5       +4     
- Misses        84      85       +1     

Impacted Files	Coverage Δ
src/K8sClusterManagers.jl	71.42% <80.00%> (+21.42%)	:arrow_up:

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