ci: Disable automatic github mirroring

.builds/archlinux.yml

@@ -1,15 +1,9 @@
 image: archlinux
-secrets:
-  - 46e8e572-0807-4a50-b2e5-614cb1c66cca
 packages:
   - rust
 sources:
   - https://git.sr.ht/~kennylevinsen/greetd
 tasks:
-  - github-mirror: |
-      cd greetd
-      ssh-keyscan github.com >> ~/.ssh/known_hosts
-      git push --quiet --mirror git@github.com:kennylevinsen/greetd.git
   - rustfmt-check: |
       cd greetd
       cargo fmt -- --check