Add release-plz for automated releases

Author: tgross35

compiler-builtins/libm/.github/workflows/publish.yml

@@ -0,0 +1,29 @@
+name: Release-plz
+
+permissions:
+  pull-requests: write
+  contents: write
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  release-plz:
+    name: Release-plz
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Rust (rustup)
+        run: rustup update nightly --no-self-update && rustup default nightly
+      - name: Publish `libm` as part of builtins, rather than its own crate
+        run: rm libm/Cargo.toml
+      - name: Run release-plz
+        uses: MarcoIeni/release-plz-action@v0.5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

compiler-builtins/libm/crates/compiler-builtins-smoke-test/Cargo.toml

@@ -3,6 +3,7 @@ name = "cb"
 version = "0.1.0"
 authors = ["Jorge Aparicio <jorge@japaric.io>"]
 edition = "2021"
+publish = false
 
 [lib]
 test = false

compiler-builtins/libm/crates/libm-bench/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["Gonzalo Brito Gadeschi <gonzalobg88@gmail.com>"]
 edition = "2021"
 license = "MIT OR Apache-2.0"
+publish = false
 
 [dependencies]
 libm = { path = "../..", default-features = false }