Update GitHub Actions, add publish job

Author: rossmacarthur

.github/workflows/build.yaml

@@ -1,29 +1,53 @@
 name: build
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   test:
+    runs-on: ubuntu-latest
+
+    env:
+      RUSTFLAGS: --deny warnings
+
     strategy:
       matrix:
         toolchain: [stable, beta, nightly]
 
-    runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
-    - uses: actions-rs/toolchain@v1
+    - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ matrix.toolchain }}
-        components: rustfmt, clippy
-        override: true
+        components: clippy, rustfmt
 
     - name: Rustfmt
       run: cargo fmt -- --check
 
     - name: Clippy
-      run: cargo clippy -- -D warnings -D clippy::use-self -D clippy::items-after-statements -D clippy::if-not-else
+      run: cargo clippy --workspace --all-targets -- -D warnings -D clippy::use-self -D clippy::items-after-statements -D clippy::if-not-else
 
     - name: Test
-      run: cargo test --workspace --locked
+      run: cargo test --workspace
+
+  publish:
+    needs: [test]
+    if: startsWith(github.ref, 'refs/tags/')
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: dtolnay/rust-toolchain@stable
+
+    - name: Calculate version from tag
+      id: version
+      run: echo "value=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+    - name: Check tag against package version
+      run: grep '^version = "${{ steps.version.outputs.value }}"$' Cargo.toml
+
+    - name: Publish
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
+      run: cargo publish