Add publish gh action for crates.io (#21)

.github/workflows/publish.yaml

@@ -0,0 +1,46 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  version:
+    name: Version
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Check version
+        run: |
+          version=`cargo metadata | jq -r '.packages[] | select(.name == "${{ env.CRATE_NAME }}") | .version'`
+          version=v"${version}"
+          [ "${version}" ] && [ "${version}" == "${{ github.ref_name }}" ]
+
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Build
+        run: cargo build --verbose
+      - name: Format
+        run: cargo fmt --all -- --check
+      - name: Clippy
+        run: cargo clippy
+      - name: Run tests
+        run: cargo test --verbose
+
+  publish:
+    name: Publish
+    needs: [version, check]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Publish
+      uses: katyo/publish-crates@v2
+      with:
+        registry-token: ${{ secrets.CARGO_REGISTRY_TOKEN }}