Add docker container to run ookla speedtest

[siegy22]

Also create a separate script that makes more sense in a container environment. The current one's error handling is not the best, because it is meant to run as a cronjob it should not output anything. In a container environment that does not really matter.

See the README adjustment for more details.

[tbblake]

Interesting and very good point. I admittedly did the docker stuff as an afterthought to just lay on top and didn't give much thought to it beyond that, which I think is obvious and you picked up on it. I'll have to look at these and add them in.

[siegy22]

@tbblake Let me know if you need any inputs, I used the following CronJob on k8s because I deployed zabbix using https://github.com/zabbix-community/helm-zabbix.

apiVersion: batch/v1
kind: CronJob
metadata:
  name: speedtest
spec:
  schedule: "0 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: speedtest
            image: siegy22/speedtest-cli-zabbix:latest
            imagePullPolicy: IfNotPresent
            env:
              - name: ZABBIX_SERVER
                value: "zabbix-zabbix-server.zabbix.svc"
              - name: SPEEDTEST_HOST
                value: "my-speedtest"
          restartPolicy: OnFailure

But as that is pretty k8s specific I didn't include it here, but might be something that people can use as well.