[TASK] Run alpha chart using SNAPSHOT digests

[aabouzaid]

Related to

Epic: https://github.com/camunda/team-distribution/issues/433

Overview

To have a consistent working deployment, we need to use the SNAPSHOT digests to deploy instead latest stable alpha tags. In many cases, there are new changes in the SNAPSHOT, and we need to ensure the alpha Helm chart works as expected.

Actions

• Add SNAPSHOT digests to the values-digest.yaml file, which is used by default for the alpha chart.
• Add Renovatebot config to auto-update the digests in the values-digest.yaml file.

Sub-tasks/PRs

• ci: add digest for all c8 apps in 8.8 chart #4120