feat: add merge queue configuration (#470)

* meta: add WIP label
* fix: remove dependabot configuration
* refactor: move renovate config to .github
* fix: label renovate PRs as "dependencies"
* feat: add mergify merge queue configuration

.github/labels.yml

@@ -64,3 +64,6 @@
 - name: wontfix
   description: This will not be worked on
   color: ffffff
+- name: work-in-progress
+  description: Work in progress that should not be auto-merged
+  color: ffffff

.github/mergify.yml

@@ -0,0 +1,28 @@
+pull_request_rules:
+  - name: self-assign PRs
+    conditions:
+      - -merged
+      - -closed
+      - "#assignee=0"
+    actions:
+      assign:
+        add_users:
+          - "{{ author }}"
+  - name: automatic merge when not WIP, CI passes, and at least 1 approving review
+    conditions:
+      - "#approved-reviews-by>=1"
+      - check-success=tests 3.10 / ubuntu-latest
+      - check-success=pre-commit 3.10 / ubuntu-latest
+      - check-success=docs-build 3.10 / ubuntu-latest
+      - base=master
+      - label!=work-in-progress
+    actions:
+      queue:
+        method: squash
+        name: default
+queue_rules:
+  - name: default
+    conditions:
+      - check-success=tests 3.10 / ubuntu-latest
+      - check-success=pre-commit 3.10 / ubuntu-latest
+      - check-success=docs-build 3.10 / ubuntu-latest

renovate.json → .github/renovate.json

@@ -6,5 +6,6 @@
     ":semanticCommits",
     ":semanticCommitTypeAll(chore)",
     ":semanticCommitScope(deps)"
-  ]
+  ],
+  "labels": ["dependencies"]
 }