ci: remove superfluous parts of github workflows (#1050)

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

.github/workflows/cluster.yaml

@@ -14,7 +14,7 @@ permissions: read-all
 jobs:
   client-tools:
     name: Stateless zot with shared reliable storage
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     # services:
     #   minio:
     #     image: minio/minio:edge-cicd
@@ -39,11 +39,6 @@ jobs:
           sudo apt-get update
           sudo apt-get -y install rpm uidmap
           # install skopeo
-          . /etc/os-release
-          echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
-          curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/Release.key | sudo apt-key add -
-          sudo apt-get update
-          sudo apt-get -y upgrade
           sudo apt-get -y install skopeo
 
           # install haproxy