Description of problem:

When building charts, the prepare.sh is using the LATEST 1.10 build, not the CORRECT build for the specified branch (1.9).

Create chart for 1.9-174 (1.9-174-CI) + index 1.10-12

So we need to ensure when reading index tags, that we filter out the incorrect ones and only use the 1.9 index for the 1.9 chart.

Checked but it seems this is NOT affecting operator bundle CSV creation.

Steps to Reproduce

TAG=1.9-175
./build/helm/prepare.sh --chart-version ${TAG}-CI --rhdh-version ${TAG}         --chart-branch release-${TAG%-*} 
...
Create chart for 1.9-175 (1.9-175-CI) + index 1.10-13
...

Expected results:

Create chart for 1.9-175 (1.9-175-CI) + index 1.9-zzz
...