Log with level error when helm release fails

[marians]

Little improvement to raise the visibility of actual errors in logs

Checklist

• Update changelog in CHANGELOG.md.

[marians]

Seems like I misunderstood the Errorf function. I thought it would mean to emit a message with level error, but it requires the parameter to actually be an error.

cannot use "helm release %#q failed, %s" (constant of type string) as error value in argument to r.logger.Errorf: string does not implement error (missing method Error)

[ljakimczuk]

@marians you can pass to it the err you have access to

[marians]

Modified the call to Errorf. PTAL