Remove agent images from release matrix

Author: mircea-cosbuc

.github/workflows/release-images.yml

@@ -18,8 +18,6 @@ jobs:
             release-key: version-upgrade-hook
           - pipeline-argument: readiness-probe
             release-key: readiness-probe
-          - pipeline-argument: agent
-            release-key: agent
 
     steps:
       - name: Checkout Code