Helm chart: bump app version to v0.20.0

[bmorton]

This bumps the app version to v0.20.0 and updates the prepare-release task in the Makefile to update the appVersion in the Helm chart.

[alexandrevilain]

Thanks, this was indeed missing.
CRDs were updated in 0.20.
Could you please update them ? Thanks :)

[bmorton]

Ah-ha! I missed the make helm target there before. It looks like appVersion is all automated too so I pulled that out of prepare-release. I think this should look more complete now!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[bmorton]

Alright -- I figured out that appVersion wasn't being updated and I ended up moving that to the helm target. When I run make helm now, it seems like everything is packaged properly.

How does this look now?

[alexandrevilain]

It looks great ! 👍

[bmorton]

I went to pull down v0.6.0, but noticed that it wasn't available. Is there another step to getting this published?

[ttretau]

Hi @bmorton ,
I think the chart release failed in the Github Action due to be failing with different GNU sed.
Adding #866 to fix this..

[ttretau]

We might need now to run the workflow manually, because there was no change in charts/.. @alexandrevilain 🙌

[alexandrevilain]

Charts is now released @bmorton :)
See: https://github.com/alexandrevilain/temporal-operator/releases/tag/helm-chart-0.6.0