Add some more parallelism to CI jobs (#1545)

* Add some more parallelism to CI jobs

Split out some work from the main "test the workspace" CI job to avoid
bottlenecking too much on that. Notably split the various extra
builds/tests into their own jobs and move the C API build/run into its
own job.

* Name the C API job differently

Author: alexcrichton

.github/workflows/main.yml

@@ -85,11 +85,33 @@ jobs:
     - name: Install Rust (rustup)
       run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
     - run: cargo test --locked --all
+
+  test_extra_features:
+    name: Test with extra Cargo features
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - run: rustup update stable --no-self-update && rustup default stable
     - run: cargo test --locked -p wasmparser --benches
     - run: cargo test --locked -p wasm-encoder --all-features
     - run: cargo test -p wasm-smith --features wasmparser
-    - run: cargo build --manifest-path crates/wast/Cargo.toml --no-default-features
-    - run: cargo build --manifest-path crates/wast/Cargo.toml --no-default-features --features wasm-module
+
+  test_capi:
+    name: Test the C API
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+          - os: macos-latest
+          - os: windows-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - run: rustup update stable --no-self-update && rustup default stable
     - run: cmake -S examples -B examples/build -DCMAKE_BUILD_TYPE=Release
     - run: cmake --build examples/build --config Release
 
@@ -191,6 +213,8 @@ jobs:
       - run: cargo check --no-default-features -p wasmparser --target x86_64-unknown-none
       - run: cargo check --no-default-features -p wasmparser --features std
       - run: cargo check --no-default-features -p wasmparser --features validate
+      - run: cargo check --no-default-features -p wast
+      - run: cargo check --no-default-features -p wast --features wasm-module
       - run: |
           if cargo tree -p wasm-smith --no-default-features -e no-dev | grep wasmparser; then
             echo wasm-smith without default features should not depend on wasmparser
@@ -231,6 +255,8 @@ jobs:
       - doc
       - build
       - verify-publish
+      - test_capi
+      - test_extra_features
     if: always()
 
     steps: