Publish releases on crates.io (#65)

.github/workflows/rust.yml

@@ -19,7 +19,8 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-  lints:
+
+  lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -37,3 +38,42 @@ jobs:
         with:
           command: clippy
           args: -- -D warnings
+
+  publish-check:
+    name: Publish Check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: cargo fetch
+      uses: actions-rs/cargo@v1
+      with:
+        command: fetch
+    - name: cargo publish check
+      uses: actions-rs/cargo@v1
+      with:
+        command: publish
+        args: --dry-run
+
+  publish:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: 
+      - test
+      - lint
+      - publish-check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: cargo fetch
+        uses: actions-rs/cargo@v1
+        with:
+          command: fetch  
+      - name: cargo publish
+        uses: actions-rs/cargo@v1
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        with:
+          command: publish