Add zoekt-ci-image-1.7
What does this MR do and why?
This MR adds a new zoekt CI image with gitlab-zoekt-indexer
set to the latest commit 2ff7245c079d350ac920d92fbcd4d32a078ac4b3
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.