Update azure.md

[DOliana]

Description

I tried the tutorial today and ran into some issues. So I decided to post an update to the tutorial.

What I did:

• updated version of the external-dns image to 0.8.0
• added notes for MSI permissions since I found that using the cluster-msi did not work since the service tried to use the agentpool msi
• and which roles can be used since a less privileged role than contributor can be used
• fixed mounting of config-file-secret, since the container started with the error that it could not find the config file azure.json

(If I missed anything I am happy to contribute)

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[DOliana]

I have signed the CNCF CLA about 16 hours ago, but for some reason it is not working... Where can I see hints on what went wrong to open a ticket?

[Raffo]

/lgtm
/approved

[Raffo]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DOliana, Raffo

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[darkn3rd]

@DOliana What was the key externaldns-config.json added? This broke the instructions as previous steps create a secret with the key azure.json. Was externaldns-config.json something unique to your environment?

[DOliana]

@darkn3rd This was more than a year ago... If I remember correctly it was just to have a proper name for reference. Nothing special to the environment.