slurmCI: Fix matrix variable resolution

- Change resolveTemplate call to pass env directly instead of ['env': env]
  to enable resolution of matrix variables like ${arch} from the environment.
- Add debug output to print original and resolved arg values for easier
  troubleshooting of template resolution issues.

Signed-off-by: Daniel Pressler <danielpr@nvidia.com>

Author: dpressle

vars/slurmCI.groovy

@@ -21,7 +21,9 @@ int call(ctx, oneStep, config) {
     }
 
     for (def entry in ctx.entrySet(args)) {
-        args[entry.key] = ctx.resolveTemplate(['env': env], entry.value.toString(), config)
+        def original = entry.value.toString()
+        args[entry.key] = ctx.resolveTemplate(env, original, config)
+        println("Resolved ${entry.key}: '${original}' -> '${args[entry.key]}'")
     }
     def stepRun = oneStep.run
     def allowedOps = ['allocation', 'run', 'stop', 'stopAllForBuild'] as Set