Because of the different loading order of values files required for MW deployments, the approach used elsewhere for T388390 does not work for services/mw-* and miscweb. As a quick & dirty fix, I hard-coded the kubernetesVersion in the helmfiles. This will eventually get forgotten and blow up in our faces, so loading the kubernetesVersion from a single source of truth is needed.
The problem: /etc/helmfile-defaults/general-* is loaded late, so kubernetesVersion isn't avaliable for rendering helmBinary.
Proposed solution: have the kubernetesVersion in a separate values file that could be loaded earlier.