ci: revert ai-assistant to direct kaniko build (no crane)

.woodpecker.yml

@@ -3,21 +3,7 @@ when:
   event: push
 
 steps:
-  - name: mirror-base-images
-    image: gcr.io/go-containerregistry/crane:debug
-    environment:
-      REG_USER:
-        from_secret: REGISTRY_USERNAME
-      REG_PASS:
-        from_secret: REGISTRY_PASSWORD
-    commands:
-      - crane auth login registry.nxtgauge.com -u "$REG_USER" -p "$REG_PASS"
-      - crane copy docker.io/library/rust:alpine registry.nxtgauge.com/rust:alpine
-      - crane copy docker.io/library/rust:1.87-alpine registry.nxtgauge.com/rust:1.87-alpine
-      - crane copy docker.io/library/alpine:3.20 registry.nxtgauge.com/alpine:3.20
-      - crane copy docker.io/library/node:20-alpine registry.nxtgauge.com/node:20-alpine
-
-  - name: build-and-push-ai-assistant
+  - name: build-and-push
     image: woodpeckerci/plugin-kaniko:2.1.1
     settings:
       registry: registry.nxtgauge.com