Revert changes to make staging run Docker

See gh-26130

ci/pipeline.yml

@@ -451,7 +451,6 @@ jobs:
     file: git-repo/ci/tasks/stage.yml
     params:
       RELEASE_TYPE: M
-      privileged: true
       <<: *gradle-enterprise-task-params
       <<: *docker-hub-task-params
   - put: artifactory-repo
@@ -472,7 +471,6 @@ jobs:
     file: git-repo/ci/tasks/stage.yml
     params:
       RELEASE_TYPE: RC
-      privileged: true
       <<: *gradle-enterprise-task-params
       <<: *docker-hub-task-params
   - put: artifactory-repo
@@ -493,7 +491,6 @@ jobs:
     file: git-repo/ci/tasks/stage.yml
     params:
       RELEASE_TYPE: RELEASE
-      privileged: true
       <<: *gradle-enterprise-task-params
       <<: *docker-hub-task-params
   - put: artifactory-repo

ci/tasks/stage.yml

@@ -14,10 +14,4 @@ params:
 caches:
 - path: gradle
 run:
-  path: bash
+  path: git-repo/ci/scripts/stage.sh
-  args:
-    - -ec
-    - |
-      source /docker-lib.sh
-      start_docker
-      ${PWD}/git-repo/ci/scripts/stage.sh