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Stabilize docker readings behavior

Christian Fiebrigrequested to merge
fiebrig/docker-hub-limit-exporter:stabilize_docker_limit_reading into main

Sometimes docker doesn't return any values in the headers. The header just contains the timespan, but not the actual value. In #4 and #5 the behavior is visible. With this pull request we do the following:

  • decode the JWT token and extract the limit contained in there
  • store the current value to re-use it on the next run when it occurs that the header returned from docker is not complete

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