small fixes to make helm build more resilient

[galmasi]

The following small fixes were required to build the helm chart successfully on an Ubuntu 22.04 machine with helm 3.11.3:

• The main chart referring to the controller has to have a version number (added "0.1.0")
• The metrics service had to have its name shortened to fit into the required 64 character limit.

With the fixes, the helm chart builds and deploys correctly (not tested with the controller, that's subject for a next PR)

Test protocol for reproducing the problems this PR claims to fix:

• Ubuntu 22.04 host, helm v3.11.3
• Checkout the current main branch of attestation operator
• make helm-clean followed by make helm to ensure a clean environment
• make helm-keylime-deploy to test the built chart
• values.yaml is mostly indifferent, corresponds to the first default in the README

[galmasi]

I just noticed that this PR duplicates the functionality of #57 . Under the circumstances let's merge 57 first, and I'll rebase this.