chore: automerge mino deps updates

Author: tgrk

.github/dependabot.yml

@@ -1,6 +1,16 @@
 version: 2
 updates:
-  - package-ecosystem: mix
-    directory: /
+  - package-ecosystem: "mix"
+    directory: "/"
     schedule:
-      interval: weekly
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+    # Optional but recommended:
+    rebase-strategy: "auto"
+    labels:
+      - "dependencies"
+      - "elixir"
+    reviewers:
+      - "tgrk"
+

.github/workflows/dependabot-auto-merge.yml

@@ -0,0 +1,40 @@
+name: Dependabot auto-merge (minor/patch)
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
+  workflow_run:
+    # Optional: if you prefer enabling auto-merge after CI finishes, use workflow_run.
+    # If you do, delete the pull_request trigger above and set the workflow name(s) here.
+    workflows: ["CI"]
+    types: [completed]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  enable-automerge:
+    # For pull_request trigger:
+    if: >
+      github.event_name == 'pull_request' &&
+      github.actor == 'dependabot[bot]' &&
+      (github.event.pull_request.user.login == 'dependabot[bot]' || github.event.pull_request.user.login == 'dependabot')
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Enable auto-merge for semver minor/patch updates
+        uses: dependabot/fetch-metadata@v2
+        id: meta
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge (minor/patch only)
+        if: >
+          (steps.meta.outputs.update-type == 'version-update:semver-minor' ||
+           steps.meta.outputs.update-type == 'version-update:semver-patch')
+        run: |
+          gh pr merge --auto --squash "${{ github.event.pull_request.html_url }}"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+