use kustomize to set image tags

tekton/kustomization.yaml

@@ -0,0 +1,11 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- kustomize-set-image.yaml
+configurations:
+- tekton-image-transformer.yaml
+images:
+- newTag: v4.5.0
+  name: k8s.gcr.io/kustomize/kustomize
+- newTag: v2.26.2
+  name: docker.io/alpine/git

tekton/kustomize-set-image.yaml

@@ -21,7 +21,7 @@ spec:
     mountPath: /src
   steps:
   - name: kustomize
-    image: k8s.gcr.io/kustomize/kustomize:v4.5.5
+    image: k8s.gcr.io/kustomize/kustomize
     workingDir: /src
     env:
     - name: HOME
@@ -65,7 +65,7 @@ spec:
       echo
       exit 0
   - name: git-push
-    image: docker.io/alpine/git:v2.26.2
+    image: docker.io/alpine/git
     workingDir: /src
     env:
     - name: HOME

tekton/tekton-image-transformer.yaml

@@ -0,0 +1,3 @@
+images:
+- path: spec/steps/image
+  kind: Task