fix: remove container specification for Kaniko job

Author: joshyorko

.github/workflows/build-kaniko-docker.yaml

@@ -23,9 +23,6 @@ concurrency:
 jobs:
   build-to-ghcr:
     runs-on: fetch-repos-bot-runner-k8s-kaniko        # self-hosted label
-    container:
-      image: gcr.io/kaniko-project/executor:v1.23.2-debug
-      options: --privileged                           # lets Kaniko access /proc/…
     permissions:
       contents: read
       packages: write                                 # push to GHCR