set version, automate release

.github/workflows/release.yml

@@ -0,0 +1,41 @@
+---
+name: release
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+*
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: parse tag
+        id: parse_tag
+        uses: actions/github-script@v4
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          result-encoding: string
+          script: |
+            return context.payload.ref.replace(/refs\/tags\//, '')
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ steps.parse_tag.outputs.result }}
+          fetch-depth: 1
+      - name: dependencies
+        run: |
+          rustup update nightly
+          rustup update stable
+          rustup target add wasm32-unknown-unknown --toolchain nightly
+          cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
+      - name: build
+        run: cargo build --verbose --release -p snapr
+      - name: strip
+        run: strip target/release/snapr
+      - name: rename
+        run: mv target/release/snapr target/release/snapr_${{ steps.parse_tag.outputs.result }}_amd64
+      - name: publish
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: |
+            target/release/snapr_${{ steps.parse_tag.outputs.result }}_amd64