Update CI templates to include 9.1 templates

/cc @markpundsack

I am not a maintainer and not really familiar with this though.

Note for the others: RC6 would be the last RC, we should tag it today or tomorrow. The rest would need to go to patch releases unless they're critical.

assigned to @ayufan

added 1 commit

• b929b80f - Revert SLUG usage, to use NAME

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resolved all discussions

approved this merge request

enabled an automatic merge when the pipeline for b929b80f succeeds

added Next Patch Release label

resolved all discussions

merged

mentioned in commit 6c65b63c

Picked into 9-1-stable, will go into 9.1.0-rc6

mentioned in commit 3abcb6b9