Use unstable cli to test

.github/workflows/build.yml

@@ -18,7 +18,7 @@ concurrency:
 jobs:
   bluebuild:
     name: Build Custom Image
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     permissions:
       contents: read
       packages: write
@@ -33,6 +33,9 @@ jobs:
       
       # the build is fully handled by the reusable github action
       - name: Build Custom Image
+        env:
+          _BUILDAH_STARTED_IN_USERNS: ""
+          BUILDAH_ISOLATION: chroot
         uses: blue-build/github-action@v1.8
         with:
           recipe: ${{ matrix.recipe }}
@@ -42,4 +45,6 @@ jobs:
           pr_event_number: ${{ github.event.number }}
 
           # enabled by default, disable if your image is small and you want faster builds
-          maximize_build_space: true
+          maximize_build_space: "true"
+          rechunk: "true"
+          use_unstable_cli: "true"