Add labels as variables for foreign_logs_enricher

[balzat]

Is your feature request related to a problem?
For foreign_logs_enricher it is not currently available to use labels as variables. It would be very useful to have this capability to create flexible playbooks.

Describe the solution you'd like
Add the capability to use the labels/annotations in the template.

customPlaybooks:
  - name: "ServiceLogErrors"
    triggers:
    - on_prometheus_alert:
        alert_name: ServiceLogErrors
    actions:
    - foreign_logs_enricher:
        label_selectors:
          - 'app=$labels.service'
        warn_on_missing_label: True

[github-actions]

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[nherment]

Hi @balzat , this has been added to the main branch. It will be part of the next release 0.19.0