Publish nightly assets on main pushes

Author: allnes

.github/workflows/nightly-openmpi.yml

@@ -142,7 +142,6 @@ jobs:
 
   publish-nightly:
     name: Publish nightly pre-release
-    if: github.event_name != 'push'
     needs: build
     runs-on: ubuntu-24.04
 

README.md

@@ -182,7 +182,7 @@ a stable tag or explicit commit, never a floating branch.
 
 - `workflow_dispatch`
 - nightly schedule at `02:37 UTC`
-- push validation on `main`
+- push builds on `main`
 
-Scheduled and manual runs replace the assets in the same `nightly` pre-release.
-Pushes to `main` build and validate packages but do not publish release assets.
+Pushes to `main`, scheduled runs, and manual runs replace the assets in the same
+`nightly` pre-release after successful builds.