feat(vector): Add digest option to vector image

[tomer-epstein]

Signed-off-by: Tomer Epstein [email protected]

Motivation
add better integrity to the image version, we should provide a way to add a digest option to the chart images this way we can validate the image version

Approach
How does this change address the problem?

Add digest option to vector chart,
By adding a new sha field to the pod file and concatenate it to the image string address when provided.

Pull Request status

• Initial implementation
• Refactoring
• Unit tests
• Integration tests

[spencergilbert]

Thanks for the contribution - Digests would be usable today by just passing image.tag: 0.22.1-distroless-libc@sha256:ba208391be6f7705f5e7bf7513ad7600cf8cc2c5dff3a4691632de3afbf0bcd0, right? This is just a more friendly way of exposing it?

[tomer-epstein]

It's more then just a friendly way.

by passing a tag that conains a digest, the labels section in the vector chart will fail.
https://github.tools.sap/api-gateway/vector-chart-wrapper/blob/65a14f1ad36255eb3146f8df826b6221cd617d29/vector/charts/vector/templates/_helpers.tpl#L40

label values in k&s are allowing only specific syntax.
https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set

Example of using digest (and tag as comment before the digest) OR tag in grafana:
https://github.com/grafana/helm-charts/blob/main/charts/grafana/templates/_pod.tpl#L397-L401

[spencergilbert]

It's more then just a friendly way.

by passing a tag that conains a digest, the labels section in the vector chart will fail. https://github.tools.sap/api-gateway/vector-chart-wrapper/blob/65a14f1ad36255eb3146f8df826b6221cd617d29/vector/charts/vector/templates/_helpers.tpl#L40

label values in k&s are allowing only specific syntax. https://github.tools.sap/api-gateway/vector-chart-wrapper/blob/65a14f1ad36255eb3146f8df826b6221cd617d29/vector/charts/vector/templates/_helpers.tpl#L40

Example of using digest (and tag as comment before the digest) OR tag in grafana: https://github.com/grafana/helm-charts/blob/main/charts/grafana/templates/_pod.tpl#L397-L401

Ah good point - I didn't think about that. I haven't written up a contributing doc yet, but we'll need to bump the minor version and run helm-docs to update the readme. I'm happy to do that if you'd prefer.

[tomer-epstein]

Sure, go for it.
Will you do it on this PR?

[tomer-epstein]

@spencergilbert can you approve?

[spencergilbert]

🤦

[tomer-epstein]

🤦
Tnx @spencergilbert
Appriciate the very quick response.