Run only after RT actions are complete

Author: scrasmussen

.github/workflows/ci_build_scm_ubuntu_nvidia.yml

@@ -1,11 +1,18 @@
 name: build the CCPP-SCM with Nvidia
 
-on: [pull_request,workflow_dispatch]
+on:
+  workflow_run:
+    workflows: ["build and run SCM regression tests"]
+    types:
+      - completed
 
 jobs:
 
   build_scm:
-    # The type of runner that the job will run on
+    # trigger only after the SCM regression tests have completed from a PR or workflow event
+    if: |
+      github.event.workflow_run.event == 'pull_request' ||
+      github.event.workflow_run.event == 'workflow_dispatch'
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false