ci: automate releases with release-plz

.github/workflows/release-plz.yml

@@ -0,0 +1,56 @@
+name: Release-plz
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release-plz-release:
+    name: Release-plz release
+    runs-on: ubuntu-latest
+    if: ${{ github.repository_owner == 'rust-lang' }}
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Authenticate with crates.io
+        uses: rust-lang/crates-io-auth-action@v1
+        id: auth
+      - name: Run release-plz
+        uses: release-plz/[email protected]
+        with:
+          command: release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}
+
+  release-plz-pr:
+    name: Release-plz PR
+    runs-on: ubuntu-latest
+    if: ${{ github.repository_owner == 'rust-lang' }}
+    permissions:
+      pull-requests: write
+      contents: write
+    concurrency:
+      group: release-plz-${{ github.ref }}
+      cancel-in-progress: false
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Run release-plz
+        uses: release-plz/[email protected]
+        with:
+          command: release-pr
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

release-plz.toml

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+[workspace]
+changelog_update = false