Support Azure Blob Storage driver

[Jonas-Beck]

Hey,

I'm currently configuring our self-hosted GitHub runners in AKS. So far, we've been using the filesystem storage driver with a PVC for GitHub Actions Cache Server. I would like to use Azure Blob Storage directly and avoid the need for a ReadWriteMany PVC.

Would you be open to a PR that adds support for Azure Blob Storage as a storage driver ?

I have already implemented the required changes in our fork and deployed them to our cluster for testing. I can see that data is uploaded correctly to Blob Storage and fetched from workflows without issues. We are currently using Workload Identity for authentication with Azure.

I have only done basic testing in our own cluster, but it is also passing existing tests using an azurite test container to simulate Azure Blob Storage.

[LouisHaftmann]

I'd prefer implementing this myself to make it easier for me to maintain in the future. Feel free to link your fork and I'll credit you in the final PR.

[Jonas-Beck]

Hi @LouisHaftmann,

Makes sense, you can find all my changes here using the feature/azblob branch.

Feel free to reach out if you would like me to testing anything in our cluster.

[LouisHaftmann]

I checked out your implementation and I don't think there is much I would do differently. It's already very clean! Feel free to create a PR.

[Jonas-Beck]

Thanks, I have created this PR with the storage provider changes.

Would you like me to also update the Helm chart to support the new azblob configurations, either in this PR or a separate PR?

[LouisHaftmann]

Put it in the same PR

[LouisHaftmann]

I'll review it when you're done

[Jonas-Beck]

Converted the PR to draft and I will update it to ready for review when I have updated the helm chart as well