simplify default run.sh because we simply do not use it. Does nothing but...

simplify default run.sh because we simply do not use it. Does nothing but waits for pod termination...

continuousintegration/docker/ctafrontend/cc7/run.sh

 #!/bin/sh 
 
-echo "ObjectStore BackendPath $objectstore" > /etc/cta/cta-frontend.conf
-echo "Catalogue NumberOfConnections 1" >>/etc/cta/cta-frontend.conf
-
-echo ${catdb} >/etc/cta/cta_catalogue_db.conf
-
-useradd cta
-# disable kerberos5 check for the admin privileges
-  sed -i -e "s/krb5/unix/" /usr/lib64/libXrdCtaOfs.so
-runuser --shell='/bin/bash' --session-command='cd ~cta; xrootd -n cta -c /etc/xrootd/xrootd-cta.cfg -I v4' cta&
-/bin/bash
+echo "Default run command: sleeping forever"
+# sleep forever but exit immediately when pod is deleted
+exec /bin/bash -c "trap : TERM INT; sleep infinity & wait"