add workflow

.github/workflows/test.yml

@@ -0,0 +1,46 @@
+on:
+  push:
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set rust version
+        run: |
+          source ci/rust-version.sh
+          echo "RUST_STABLE=$rust_stable" | tee -a $GITHUB_ENV
+
+      # The toolchain action should definitely be run before the cache action
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: ${{ env.RUST_STABLE }}
+          components: rustfmt, clippy
+          cache: false
+          # avoid the default "-D warnings" which thrashes cache
+          rustflags: ""
+
+      # https://github.com/actions/cache/blob/main/examples.md#rust---cargo
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Run fmt+clippy
+        run: |
+          cargo fmt --all --check
+          cargo clippy --workspace --all-targets
+
+      - name: Build
+        run: |
+          cargo build --all-targets