From 4d9e60811986b222f0574ee3dd3788d6a0589e63 Mon Sep 17 00:00:00 2001
From: Mathias Vanden Auweele <mathias@matdata.eu>
Date: Sun, 18 Oct 2026 18:06:33 +0000
Subject: [PATCH] ci: group Dependabot updates and auto-merge minor and patch
 bumps

Monthly grouped updates with a 7-day cooldown and conventional commit prefixes. Minor and patch updates auto-merge once CI passes; majors stay open for review.
---
 .github/dependabot.yml                     | 49 ++++++++++++++++++++++
 .github/workflows/dependabot-automerge.yml | 21 ++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 .github/dependabot.yml
 create mode 100644 .github/workflows/dependabot-automerge.yml

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..b3a7624
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,49 @@
+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: monthly
+    cooldown:
+      default-days: 7
+    open-pull-requests-limit: 5
+    labels: [dependencies]
+    commit-message:
+      prefix: chore
+      prefix-development: chore
+      include: scope
+    groups:
+      cargo:
+        update-types: [minor, patch]
+      cargo-security:
+        applies-to: security-updates
+        patterns: ["*"]
+    # Majors stay ungrouped: one PR each, never auto-merged.
+
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: monthly
+    cooldown:
+      default-days: 7
+    labels: [dependencies]
+    commit-message:
+      prefix: chore
+      include: scope
+    groups:
+      docker:
+        patterns: ["*"]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    cooldown:
+      default-days: 7
+    labels: [dependencies]
+    commit-message:
+      prefix: ci
+      include: scope
+    groups:
+      actions:
+        patterns: ["*"]
diff --git a/.github/workflows/dependabot-automerge.yml b/.github/workflows/dependabot-automerge.yml
new file mode 100644
index 0000000..356a7b1
--- /dev/null
+++ b/.github/workflows/dependabot-automerge.yml
@@ -0,0 +1,21 @@
+name: Dependabot auto-merge
+
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  automerge:
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    steps:
+      - id: meta
+        uses: dependabot/fetch-metadata@v2
+      # Majors stay open for a manual look. The merge waits for the required CI checks.
+      - if: steps.meta.outputs.update-type != 'version-update:semver-major'
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}