ci: Fix image ref for the local build

Followup to 0fbb02e

Author: alatiera

Justfile

@@ -4,7 +4,7 @@ default:
     @just --list
 
 # ── Configuration ─────────────────────────────────────────────────────
-export image_name := env("BUILD_IMAGE_NAME", "ghcr.io/projectbluefin/dakota")
+export image_name := env("BUILD_IMAGE_NAME", "dakota")
 export image_tag := env("BUILD_IMAGE_TAG", "latest")
 export base_dir := env("BUILD_BASE_DIR", ".")
 export filesystem := env("BUILD_FILESYSTEM", "btrfs")
@@ -58,7 +58,7 @@ build:
     echo "oci-image-created: '${OCI_IMAGE_CREATED}'" >> include/revisions.yml
     echo "oci-image-version: '${OCI_IMAGE_VERSION}'" >> include/revisions.yml
 
-    echo "oci-image-name: '{{image_name}}'" >> include/revisions.yml
+    echo "oci-image-name: '${IMAGE_REGISTRY}/${IMAGE_NAME}'" >> include/revisions.yml
     echo "oci-image-tag: '{{image_tag}}'" >> include/revisions.yml
 
     echo "==> Building OCI image with BuildStream (inside bst2 container)..."