actions: add release workflow

It help to create github release and publish to crate.io automatically
when a new tag is pushed.

Signed-off-by: Peng Tao <[email protected]>

Author: bergwolf

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Publish
+        run: |
+          sudo apt-get update && sudo apt-get install -y sed
+          VERSION=$(sed -E -n 's/^version = \"(.*)"$/\1/p' Cargo.toml)
+          [ "$GITHUB_REF_NAME" == "v$VERSION" ]
+          cargo publish --token ${{ secrets.CRATES_IO_TOKEN }}
+      - name: Release
+        uses: softprops/action-gh-release@v1