chore: mirror as separate build

.builds/ci.yml

@@ -8,7 +8,8 @@ secrets:
   - 01f84277-3abe-4ed1-9d0d-d66b49bfcfe7
   - 5756e542-1a3e-4c27-ac4c-4820cff2b965
   - 576364b7-4764-4794-a536-1a3357fb222b
-  - 3f89fef9-5367-4a4e-abcd-48428e354073
+environment:
+  CI: "true"
 tasks:
   - setup: |
       sudo n stable
@@ -23,8 +24,4 @@ tasks:
   - publish: |
       . ~/.npm-token
       cd angularjs-testing-library
-      CI=true yarn semantic-release
-  - mirror: |
-      cd angularjs-testing-library
-      ssh-keyscan github.com >> ~/.ssh/known_hosts
-      git push --mirror git@github.com:statianzo/angularjs-testing-library.git
+      yarn semantic-release

.builds/mirror.yml

@@ -0,0 +1,15 @@
+image: archlinux
+secrets:
+- 3f89fef9-5367-4a4e-abcd-48428e354073
+sources:
+- https://git.sr.ht/~statianzo/angularjs-testing-library
+tasks:
+- master_only: |
+    cd angularjs-testing-library
+    if [ "$(git rev-parse origin/master)" != "$(git rev-parse HEAD)" ]; then \
+      complete-build; \
+    fi
+- mirror: |
+    cd angularjs-testing-library
+    ssh-keyscan github.com >> ~/.ssh/known_hosts
+    git push --mirror git@github.com:statianzo/angularjs-testing-library.git