mergify: replace bors's merge queue

.github/workflows/update-flake-lock.yml

@@ -19,3 +19,5 @@ jobs:
         uses: DeterminateSystems/update-flake-lock@v19
         with:
           token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}
+          pr-labels: |                  # Labels to be set on the PR
+            merge-queue

.mergify.yml

@@ -1,15 +1,21 @@
-pull_request_rules:
-  - name: automatic merge on CI success
-    conditions:
+queue_rules:
+  - name: default
+    merge_conditions:
       - check-success=Evaluate flake.nix
-      - check-success=package nix-eval-jobs [x86_64-linux]
-      - check-success=devShell default [x86_64-linux]
       - check-success=check treefmt [x86_64-linux]
+      - check-success=devShell default [x86_64-linux]
       - check-success=package default [x86_64-linux]
-      - check-success=tests (ubuntu-latest)
+      - check-success=package nix-eval-jobs [x86_64-linux]
       - check-success=tests (macos-latest)
-      - author=nix-eval-jobs-bot
+      - check-success=tests (ubuntu-latest)
+defaults:
+  actions:
+    queue:
+      allow_merging_configuration_change: true
+pull_request_rules:
+  - name: merge using the merge queue
+    conditions:
+      - base=main
+      - label=merge-queue
     actions:
-      merge:
-        method: merge
-      delete_head_branch: {}
+      queue: {}

bors.toml

@@ -1,12 +0,0 @@
-cut_body_after = "" # don't include text from the PR body in the merge commit message
-status = [
-  # garnix
-  "Evaluate flake.nix",
-  "package nix-eval-jobs [x86_64-linux]",
-  "devShell default [x86_64-linux]",
-  "check treefmt [x86_64-linux]",
-  "package default [x86_64-linux]",
-  # github actions
-  "tests (ubuntu-latest)",
-  "tests (macos-latest)"
-]