add next tag to on-push (#154)

Signed-off-by: Michael Valdron <[email protected]>

Author: michael-valdron

.tekton/registry-viewer-main-push.yaml

@@ -512,6 +512,9 @@ spec:
       params:
       - name: IMAGE
         value: $(tasks.build-image-index.results.IMAGE_URL)
+      - name: ADDITIONAL_TAGS
+        value:
+          - next
       runAfter:
       - build-image-index
       taskRef: