ci: update readme (and pipeline)

rust-bindings/rust/Makefile

@@ -48,12 +48,3 @@ gir-files:
 gir-files/OSTree-1.0.gir:
 	echo Best to build libostree with all features and use that
 	exit 1
-
-
-# CI config generation
-ci-build-stages:
-	@for tgt in `cargo read-manifest | jq -jr '.features | keys | map(select(. != "dox")) | map(. + " ") | .[]'`; do \
-  		echo "build_$$tgt:"; \
-  		echo "  stage: build"; \
-  		echo "  script: cargo test --verbose --workspace --features $$tgt"; \
-  	done