chore: update dependabot & add release-plz workflow

.github/dependabot.yml

@@ -1,13 +1,25 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
   - package-ecosystem: "cargo"
     directory: "/"
     schedule:
       interval: "daily"
-    allow:
-      - dependency-type: direct
+      # Check for cargo updates at 3am UTC
+      time: "03:00"
+    open-pull-requests-limit: 10
+    groups:
+      batch:
+        applies-to: version-updates
+        patterns:
+          - "*"
+  - package-ecosystem: "rust-toolchain"
+    directory: "/"
+    schedule:
+      interval: weekly
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      # Check for cargo updates at 3am UTC
+      time: "03:00"
+    open-pull-requests-limit: 3

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+name: Release-plz
+on:
+  push:
+    branches:
+      - main
+jobs:
+  # Release unpublished packages.
+  release-plz-release:
+    name: Release-plz release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - &checkout
+        name: Checkout repository
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - &install-rust
+        name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Run release-plz
+        uses: release-plz/action@v0.5
+        with:
+          command: release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+  # Create a PR with the new versions and changelog, preparing the next release.
+  release-plz-pr:
+    name: Release-plz PR
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    concurrency:
+      group: release-plz-${{ github.ref }}
+      cancel-in-progress: false
+    steps:
+      - *checkout
+      - *install-rust
+      - name: Run release-plz
+        uses: release-plz/action@v0.5
+        with:
+          command: release-pr
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}