[CI] CI weekly placeholder (#1740)

Placeholder to be able to start the workflow from the dedicated branch
for CI weekly.

Author: HereThereBeDragons

.github/workflows/ci_weekly.yml

@@ -0,0 +1,15 @@
+name: WIP Placeholder CI Weekly
+
+on:
+    # For AMD GPU families that expect_failure, we run builds and tests from this scheduled trigger
+    # schedule:
+    #   - cron: "0 3 * * 0" # Runs weekly at 3 AM UTC Sundays
+    workflow_dispatch:
+
+
+jobs:
+  donothing:
+    runs-on: ubuntu-latest
+    if: false
+    steps:
+      - run: echo "Skipped"