Use install-action to install cross

.github/workflows/ci.yml

@@ -61,6 +61,9 @@ jobs:
       - name: Install Rust
         # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
         run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
+      - name: Install cross
+        uses: taiki-e/install-action@cross
+        if: matrix.target != ''
       - name: Test
         run: ./ci/test.sh
 
@@ -79,7 +82,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install Rust
         run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
-      - uses: taiki-e/install-action@cargo-hack
+      - name: Install cargo-hack
+        uses: taiki-e/install-action@cargo-hack
       - name: Check features
         run: ./ci/check-features.sh
 
@@ -90,7 +94,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install Rust
         run: rustup update nightly && rustup default nightly
-      - uses: taiki-e/install-action@cargo-hack
+      - name: Install cargo-hack
+        uses: taiki-e/install-action@cargo-hack
       - name: dependency tree check
         run: ./ci/dependencies.sh
 

ci/test.sh

@@ -7,7 +7,6 @@ export RUSTFLAGS="-D warnings"
 
 if [[ -n "$RUST_TARGET" ]]; then
     # If RUST_TARGET is specified, use cross for testing.
-    cargo install cross
     cross test --all --target "$RUST_TARGET" --exclude benchmarks -- --test-threads=1
 
     # For now, the non-host target only runs tests.