Use buildah driver

.gitlab-ci.yml

@@ -21,7 +21,7 @@ variables:
 build-image:
   stage: build
   image: 
-    name: ghcr.io/blue-build/cli:main
+    name: ghcr.io/blue-build/cli:143-feat-allow-overriding-the-build-strategy
     entrypoint: [""]
   services:
     - docker:dind
@@ -43,4 +43,4 @@ build-image:
     - export COSIGN_PRIVATE_KEY=$(cat .secure_files/cosign.key)
   script:
     - sleep 5
-    - bluebuild build -vv --push ./config/$RECIPE
+    - bluebuild build -vv -B buildah --push ./config/$RECIPE