Auto merge of #2953 - RalfJung:cron, r=RalfJung

sadly 'gh' doesnt support all git upstream branch configs

src/tools/miri/.github/workflows/ci.yml

@@ -11,7 +11,7 @@ on:
       - 'master'
   schedule:
     - cron: '6 6 * * *' # At 6:06 UTC every day.
-    - cron: '12 * * * *' # Also each hour, for testing
+    - cron: '22 * * * *' # Also each hour, for testing
 
 env:
   CARGO_UNSTABLE_SPARSE_REGISTRY: 'true'
@@ -203,7 +203,9 @@ jobs:
           ./miri toolchain
           ./miri fmt --check || (./miri fmt && git commit -am "fmt")
       - name: Push changes to a branch
-        run: git push -u origin HEAD:"rustup$(date -u +%Y-%m-%d)"
+        run: |
+          git switch -c "rustup$(date -u +%Y-%m-%d)"
+          git push -u origin
       - name: Create Pull Request
         run: gh pr create -B master --title 'Automatic sync from rustc' --body ''
         env: