Adding a simple crates.io release workflow, including MSRV check

.github/workflows/build.yml

@@ -4,6 +4,7 @@ env:
   # A fixed version used for testing, so that the builds don't
   # spontaneously break after a few years.
   RUST_VERSION: "1.90.0"
+  MIN_RUST_VERSION: "1.85.0"
   CARGO_TERM_COLOR: always
 
 jobs:
@@ -50,6 +51,21 @@ jobs:
       - name: check
         run: cargo +${RUST_VERSION} test
 
+  # Validate minimum supported Rust version declared in `Cargo.toml`.
+  # Note that warnings are allowed as some may appear due to backwards
+  # compatiblity issues.
+  minimum-supported:
+    name: Minimum version
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install rust version
+        run: rustup install ${MIN_RUST_VERSION}
+      - name: check
+        run: cargo +${MIN_RUST_VERSION} check --all-features
+      - name: check
+        run: cargo +${MIN_RUST_VERSION} test --all-features
+
   # Run tests on macOS.
   test-macos:
     needs: check

.github/workflows/release.yml

@@ -0,0 +1,51 @@
+name: Publish to crates.io
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+      - 'v*.*.*-alpha.*'
+      - 'v*.*.*-beta.*'
+      - 'v*.*.*-rc.*'
+
+env:
+  MIN_RUST_VERSION: "1.85.0"  
+
+jobs:
+  # Validate minimum supported Rust version declared in `Cargo.toml`.
+  # Note that warnings are allowed as some may appear due to backwards
+  # compatiblity issues.
+  minimum-supported:
+    name: Minimum version
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install rust version
+        run: rustup install ${MIN_RUST_VERSION}
+      - name: check
+        run: cargo +${MIN_RUST_VERSION} check --all-features
+      - name: check
+        run: cargo +${MIN_RUST_VERSION} test --all-features
+
+  crates_io_publish:
+    name: Publish (Crates.io)
+    needs:
+      - minimum-supported
+    permissions:
+      contents: write  # required to create a release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install rust version
+        run: rustup install ${MIN_RUST_VERSION}
+      - run: cargo publish --token "${{ env.CRATES_IO_API_TOKEN }}"
+        env:
+          CRATES_IO_API_TOKEN: ${{ secrets.CRATES_IO_API_TOKEN }}
+      - name: Create draft release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.version.outputs.tag }}
+          draft: true
+          body: "This is a release draft generated by Github Actions..."
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Cargo.toml

@@ -7,6 +7,9 @@ build = "build.rs"
 description = "Bindings for CU Decision Diagram library (CUDD)"
 repository = "https://github.com/pclewis/cudd-sys"
 license = "CC0-1.0"
+# This is the minimum version that support Rust 2024. If you ever 
+# increase this version, please also update in both Github Actions workflows.
+rust-version = "1.85"
 
 [dependencies]
 libc = "0.2"