Update release drafter + mergify config

- Make dependency updates separate section
- add config for mergify to auto-morge dependency updates

.github/release-drafter.yml

@@ -17,8 +17,10 @@ categories:
   - title: "💚 Maintenance"
     labels:
       - 'chore'
-      - 'dependencies'
       - 'documentation'
+  - title: "🧱 Dependencies"
+    labels:
+      - 'dependencies'
 
 change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
 version-resolver:

.github/renovate.json

@@ -0,0 +1,12 @@
+{
+  "automerge": true,
+  "labels": ["dependencies"],
+  "packageRules": [
+    {
+      "matchManagers": [
+        "sbt"
+      ],
+      "enabled": false
+    }
+  ]
+}

.mergify.yml

@@ -0,0 +1,15 @@
+pull_request_rules:
+  - name: label renku-bot's PRs
+    conditions:
+      - author=RenkuBot
+    actions:
+      label:
+        add: ["dependencies"]
+  - name: automatically merge renku-bot PRs on CI success
+    conditions:
+      - author=RenkuBot
+      - base=developement
+      - status-success=ci
+    actions:
+      merge:
+        method: merge