Set up release-plz (rust-lang/backtrace-rs#707)

Add a release-plz workflow and ensure that all unneeded packages are
marked `publish = false`. We should get both the release PRs and the
automatic publish on version changes.

Author: tgross35

.github/workflows/publish.yml

@@ -0,0 +1,52 @@
+name: Release-plz
+
+permissions:
+  pull-requests: write
+  contents: write
+
+on:
+  push: { branches: [master] }
+
+jobs:
+  # Release unpublished packages.
+  release-plz-release:
+    name: Release-plz release
+    runs-on: ubuntu-24.04
+    if: ${{ github.repository_owner == 'rust-lang' }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Rust toolchain
+        run: rustup update stable --no-self-update && rustup default 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-24.04
+    if: ${{ github.repository_owner == 'rust-lang' }}
+    concurrency:
+      group: release-plz-${{ github.ref }}
+      cancel-in-progress: false
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Rust toolchain
+        run: rustup update stable --no-self-update && rustup default stable
+      - 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 }}

crates/cpp_smoke_test/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
 edition = "2021"
 build = "build.rs"
+publish = false
 
 [build-dependencies]
 cc = "1.0"

crates/debuglink/Cargo.toml

@@ -2,6 +2,7 @@
 name = "debuglink"
 version = "0.1.0"
 edition = "2021"
+publish = false
 
 [dependencies]
 backtrace = { path = "../.." }

crates/line-tables-only/Cargo.toml

@@ -2,6 +2,7 @@
 name = "line-tables-only"
 version = "0.1.0"
 edition = "2021"
+publish = false
 
 [build-dependencies]
 cc = "1.0"

crates/macos_frames_test/Cargo.toml

@@ -3,6 +3,7 @@ name = "macos_frames_test"
 version = "0.1.0"
 authors = ["Aaron Hill <aa1ronham@gmail.com>"]
 edition = "2021"
+publish = false
 
 [dependencies.backtrace]
 path = "../.."

crates/without_debuginfo/Cargo.toml

@@ -3,6 +3,7 @@ name = "without_debuginfo"
 version = "0.1.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 edition = "2021"
+publish = false
 
 [dependencies.backtrace]
 path = "../.."