[WIP] Feature/install module from git

[christoph2497]

So far only working for modules that don't require any further configuration

[mkayontour]

Would propose a new variable for external modules with configuration.

icingaweb2_custom_modules:
  grafana:
    enabled: true
    source: git,url,tag
    files:
      - name: config.ini
         sections:     #naming could be something else
            options:
               graphite_host: url
               graphite_port: foobar

Alternative:

icingaweb2_custom_modules:
  grafana:
    enabled: true
    source: git,url,tag
    files:
      - config
    config:
      sectionname:
        graphite_host: url
        graphite_port: foobar

[mkayontour]

hi, can you merge the current main and then we will together review the PR?