Change precheck in release pipeline to OCI infra

Precheck in release pipeline was based on gcs. This move
it to OCI infra.

Author: khrm

tekton/release-pipeline.yaml

@@ -96,9 +96,9 @@ spec:
         - name: url
           value: https://github.com/tektoncd/plumbing
         - name: revision
-          value: aeed19e5a36f335ebfdc4b96fa78d1ce5bb4f7b8
+          value: b5d215c1d28fa64a89c568fac38f88f5c62d7e96
         - name: pathInRepo
-          value: tekton/resources/release/base/prerelease_checks.yaml
+          value: tekton/resources/release/base/prerelease_checks_oci.yaml
     params:
       - name: package
         value: $(params.package)
@@ -110,6 +110,8 @@ spec:
       - name: source-to-release
         workspace: workarea
         subPath: git
+      - name: oci-credentials
+        workspace: release-secret
 
   - name: unit-tests
     runAfter: [precheck]