Add GitHub actions again

.github/workflows/publish.yml

@@ -0,0 +1,30 @@
+name: Publish to crates.io
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+env:
+  CARGO_TERM_COLOR: always
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+      - name: Cache build artifacts
+        id: cache-build
+        uses: actions/cache@v2
+        with:
+          path: target/**
+          key: ${{ runner.os }}-build-cache
+      - name: Annotate commit with clippy warnings
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features