fix(Jenkinsfile): use sleep infinity (no TTY) for nova-ci idle process

Build #32 reached the Build stage but nova-ci's first sh died with:

  process apparently never started in
  /home/jenkins/agent/workspace/nova-cicd@tmp/durable-d3168952
  ERROR: script returned exit code -2

Pod ownership (fsGroup) was fixed in the previous commit, so this is a
different failure: ttyEnabled=true + command='cat' is the well-known
trigger for durable-task "process apparently never started" / exit -2.
durable-task uses kubectl exec to attach a non-TTY wrapper script to a
TTY-allocated container, and on this controller's plugin/runtime combo
the wrapper fails to launch.

Use the standard workaround:

  ttyEnabled: false
  command:    'sleep'
  args:       'infinity'

Just dropping the TTY (keeping 'cat') was tried before on claude-broke-it
and broke differently: cat exits on stdin EOF and Kubernetes terminates
the sidecar during Get Token. sleep infinity is the canonical idle
process for durable-task exec containers and is what the working
configuration on claude-broke-it converged to.

Signed-off-by: Edwin Peer <epeer@nvidia.com>

Author: espeer

Jenkinsfile

@@ -37,6 +37,11 @@
 //   Without fsGroup that fails with "process apparently never started" / exit code -2 (build #31).
 //   Only fsGroup is set at pod scope — runAs lives on the container — so PodTemplateUtils.combine()
 //   has nothing to merge into pod securityContext and won't drop fsGroup.
+// - nova-ci must use ttyEnabled=false with command='sleep' args='infinity' (NOT the default
+//   ttyEnabled=true + 'cat'). The TTY+cat pattern triggers durable-task "process apparently
+//   never started" / exit -2 when kubectl-exec attaches a non-TTY wrapper script to a TTY-enabled
+//   container (build #32 in nova-ci). ttyEnabled=false + 'cat' also breaks (cat exits on stdin
+//   EOF and the sidecar terminates); sleep infinity is the canonical idle process.
 
 @Library('blossom-github-lib@master')
 import ipp.blossom.*
@@ -106,8 +111,9 @@ spec:
     containerTemplate(
       name: 'nova-ci',
       image: ciImage,
-      ttyEnabled: true,
-      command: 'cat'
+      ttyEnabled: false,
+      command: 'sleep',
+      args: 'infinity'
     )
   ]
 ) {