FEAT(tekton): add OCI manifest list support for Image Updater

- Update buildah task to create OCI manifest list format
- Push images with both :latest and specific tags
- Update all pipelines to use new IMAGE/TAG parameters
- Enable ArgoCD Image Updater digest detection

tekton/ci-cd/manifests/pipelines/fastapi-pipeline.yaml

@@ -47,7 +47,9 @@ spec:
         - clone
       params:
         - name: IMAGE
-          value: zot0213.kro.kr/$(params.app-name):$(params.git-revision)
+          value: zot0213.kro.kr/$(params.app-name)
+        - name: TAG
+          value: $(params.git-revision)
         - name: DOCKERFILE
           value: ./Dockerfile
         - name: CONTEXT

tekton/ci-cd/manifests/pipelines/nextjs-pipeline.yaml

@@ -51,7 +51,9 @@ spec:
         - clone
       params:
         - name: IMAGE
-          value: zot0213.kro.kr/$(params.app-name):$(params.git-revision)
+          value: zot0213.kro.kr/$(params.app-name)
+        - name: TAG
+          value: $(params.git-revision)
         - name: DOCKERFILE
           value: ./Dockerfile
         - name: CONTEXT

tekton/ci-cd/manifests/pipelines/python-pipeline.yaml

@@ -47,7 +47,9 @@ spec:
         - clone
       params:
         - name: IMAGE
-          value: zot0213.kro.kr/$(params.app-name):$(params.git-revision)
+          value: zot0213.kro.kr/$(params.app-name)
+        - name: TAG
+          value: $(params.git-revision)
         - name: DOCKERFILE
           value: ./Dockerfile
         - name: CONTEXT