add recreate option for update-policy directive

[kvaps]

This PR adds new option:

directives.qbec.io/update-policy: recreate

Which allow to recreate resources when they change. This might be really useful for updating jobs and some other immutable objects eg. storage class.

see https://github.com/kubernetes/kubernetes/issues/89657 for more details

solves: https://github.com/splunk/qbec/issues/64 partially solves: https://github.com/splunk/qbec/issues/149

Now post-install and post-upgrade helm hooks can be achieved by rewriting them with directives.qbec.io/update-policy: recreate annotation)

Another trick can be used if you really need to run job every apply, this can be achieved by adding another annotation with random data, eg.:

  annotations: {
    'directives.qbec.io/update-policy': 'recreate',
    'apply-uuid': importstr "/proc/sys/kernel/random/uuid"
  }

[codecov-io]

Codecov Report

Merging #189 (c4ceba0) into master (3ef9f8e) will decrease coverage by 0.38%. The diff coverage is 9.37%.

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
- Coverage   73.30%   72.92%   -0.39%     
==========================================
  Files          51       51              
  Lines        4252     4284      +32     
==========================================
+ Hits         3117     3124       +7     
- Misses        961      986      +25     
  Partials      174      174              

Impacted Files	Coverage Δ
internal/remote/client.go	0.00% <0.00%> (ø)
internal/commands/apply.go	79.33% <100.00%> (+0.27%)	:arrow_up:
internal/commands/directives.go	100.00% <100.00%> (ø)
internal/eval/eval.go	94.61% <0.00%> (ø)
internal/commands/diff.go	85.30% <0.00%> (ø)
internal/model/app.go	94.71% <0.00%> (+0.01%)	:arrow_up:
internal/commands/config.go	89.24% <0.00%> (+0.05%)	:arrow_up:
internal/model/k8s.go	90.00% <0.00%> (+0.41%)	:arrow_up:

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[Andor]

@gotwarlost any updates here? The PR is open for a quite some time and contains meaningful changes. Could you please consider reviewing it again?

[gotwarlost]

will do shortly.