use conclusion job to determine pr success for bors

Author: Emilgardis

.github/bors.toml

@@ -1,11 +1,4 @@
 block_labels = ["needs-decision"]
 delete_merged_branches = true
 required_approvals = 1
-status = [
-        "ci (1.46.0, ubuntu-latest, false)",
-        "ci (1.46.0, macos-latest, false)",
-        "ci (1.46.0, windows-latest, false)",
-        "ci (stable, ubuntu-latest, false)",
-        "ci (stable, macos-latest, false)",
-        "ci (stable, windows-latest, false)",
-]
+status = ["conclusion"]

.github/workflows/ci.yml

@@ -69,3 +69,9 @@ jobs:
         with:
           command: strip
           args: --bin cargo-strip -v
+  conclusion:
+    runs-on: ubuntu-latest
+    needs: ci
+    steps:
+      - name: Result
+        run: exit 0