out-of-sync repos

[PhotonQuantum]

1. openwrt - upstream url change
   • [x] PR created (#465)
   • [x] Initial sync (in-progress, blocking)
   • [x] Merge PR #465 (do not merge before #464)
2. ubuntu-cdimage - lagging behind
   • [x] Catch up by syncing from tuna
   • ~Sync again from upstream~ (soooooo sloooooooow!!!!!)
   • [x] Merge PR: Switching upstream to tuna (#468)
   • [x] Deploy all previous PRs and restart lug service (#464 will be applied at this moment)
3. linuxbrew-core - upstream gone
   • [x] Inform users about the change through news.
   • [x] PR: Remove config entry (#466) (also https://github.com/sjtug/mirror-requests/issues/359)
   • [x] Deploy and restart lug service
   • [x] Delete folder
4. ubuntukylin and ubuntukylin-cdimage - authentication required
   • [ ] PR: support secrets in lug config (#460)
   • [ ] Deploy and check if anything breaks
   • [ ] PR: update siyuan config to include passwords
   • [ ] Update secrets
   • [ ] Initial sync
   • [ ] Deploy and restart lug service