workflows: u-boot: Add weekly build

Signed-off-by: Loïc Minier <[email protected]>

Author: lool

.github/workflows/u-boot.yml

@@ -1,6 +1,9 @@
 name: Build U-Boot for RB1
 
 on:
+  # run weekly on Monday at 8:30am
+  schedule:
+    - cron: '30 8 * * 1'
   # allow manual runs
   workflow_dispatch:
 
@@ -23,6 +26,8 @@ concurrency:
 
 jobs:
   build-u-boot-rb1:
+    # don't run cron from forks of the main repository or from other branches
+    if: github.repository == 'qualcomm-linux/qcom-deb-images' && github.ref == 'refs/heads/main'
     # for cross-builds
     runs-on: [self-hosted, qcom-u2404, amd64]
     # alternative for native builds, but overkill to do both