dots get propagated into invalid names

[rcmorano]

Aloha,

I've been converting some compose files to Helm charts (concretely DAppNode's project ones) and ran into the same problem exposed in #420.
In fact it's the last comment from @xiaoping378 in this issue.

I've created #1063 PR following the guidelines of previous PRs #509 and #569 which fixed the problem and added the needed warning bits to documentation.
I Hope you find it's suitable to merge or as base for future work on the issue :)

Best!