Add redback-jax to docker_images.txt

Add nsarinastro/redback-jax:latest and :gpu for CVMFS/Singularity sync.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: nikhil-sarin

docker_images.txt

@@ -630,6 +630,9 @@ michaelwcoughlin/ztfperiodic:latest
 # NMMA/fiesta light-curve fitting
 michaelwcoughlin/fiesta:latest
 michaelwcoughlin/fiesta-gpu:latest
+# redback-jax transient inference
+nsarinastro/redback-jax:latest
+nsarinastro/redback-jax:gpu
 
 #intel
 intel/oneapi-hpckit