Define type for pipeline params

Although not always enforced the tekton validation complains about it.

Signed-off-by: Luiz Carvalho <[email protected]>

Author: lcarva

.tekton/rhtap-task-runner-pull-request.yaml

@@ -105,6 +105,7 @@ spec:
       description: Image tag expiration time, time values could be something like
         1h, 2d, 3w for hours, days, and weeks, respectively.
       name: image-expires-after
+      type: string
     - default: "false"
       description: Build a source image.
       name: build-source-image

.tekton/rhtap-task-runner-push.yaml

@@ -101,6 +101,7 @@ spec:
       description: Image tag expiration time, time values could be something like
         1h, 2d, 3w for hours, days, and weeks, respectively.
       name: image-expires-after
+      type: string
     - default: "false"
       description: Build a source image.
       name: build-source-image