[self-hosted] Platform Support Matrix

[csweichel]

At the moment we have no defined set of platforms we support/test for with Gitpod Self-Hosted. We must produce a defined set of platforms we support, maintain this set and subsequently test those platforms. As a first step, we should produce this list and add it to the documentation.

The Platform Support Matrix would be structured along the following dimensions:

• Kubernetes version
• Operating System / Linux Distribution
• Linux Kernel version
• Kubernetes Platform Provider (e.g. GKE, Amazon EKS, Azure Kubernetes Service, Kubermatic)
• Object Store (e.g. GCP Buckets, Amazon S3, MinIO)

For example:

Kubernetes Platform Provider	Kubernetes Version	Kernel Version	Operating System	Object Store
Google Kubernetes Engine	1.17	> 4.14	Ubuntu Containerd	GCP Buckets
Amazon Elastic Container Service	> 1.16	>= 5.0	TBD.	Amazon S3
kubeadm	1.17	>= 5.0	Ubuntu 20.04	MinIO

We could also add another column to indicate something of a support/test level. I.e. there are probably many more combinations we expect to work but don't explicitly test. Also, we'll want to deprecate combinations in the future and should be able to mark them as deprecated.

[csweichel]

We might want to split this up even for specific features. In general we're following a strategy best summed up as "common features with common requirements; specialised features can use specialised requirements".

For example:

• common feature, common requirements: when user-namespaced workspaces become the default, this feature must not impose specialised requirements anymore (e.g. Ubuntu as OS)
• specialised feature, specialised requirement: dynamic resource limiting done by ws-daemon requires containerd in a particular version.

On top of the matrix described above, we should explicitly list what we consider specialised features, and what requirements they impose.

[stale]

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