adding correct commands to tekton push file

.tekton/clowder-push.yaml

@@ -197,7 +197,7 @@ spec:
           - name: kustomize-build
             image: registry.access.redhat.com/ubi8/ubi:latest
             workingDir: /var/workdir/source
-            script: set -xe && dnf install -y git go make && make update-version
+            script: set -e && dnf install -y git go make && git fetch --prune --unshallow && CLOWDER_VERSION='$("git describe --tags")' && make update-version
         volumes:
           # New volume to store a copy of the source code accessible only to this Task.
           - name: workdir