news: release v0.29.0

build: remove cargo-chef, revert to stable rust

store: Improve predictability of the time for each batch during pruning

news: Document deduplicate triggers fix

ci: share kaniko cache across steps

ci: fix kaniko args

ci: try using kaniko for caching

dockerfile: fix recipe filepath

ci: try removing lutter tagging

ci: rm -rf changed files in envsubst