Use pre-built cargo-hack in CI

The authors of cargo-hack provide an Action to use in CI and avoid having to build from source.
Currently the MSRV CI job fails because latest cargo-hack requires 1.56 to build while the test is
run with 1.46.
Simply running cargo-hack only requies 1.26 though.

This should also speedup CI runs, since we don't have to build cargo-hack each time.

Author: LingMan

.github/workflows/main.yml

@@ -37,11 +37,10 @@ jobs:
             rust: stable
     steps:
     - uses: actions/checkout@master
+    - uses: taiki-e/install-action@cargo-hack
     - name: Install Rust (rustup)
       run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
       shell: bash
-    - name: Install cargo-hack
-      run: cargo install cargo-hack
     - name: Run tests
       run: cargo hack test --feature-powerset && cargo hack test --feature-powerset --release
 
@@ -66,10 +65,9 @@ jobs:
         target: ["aarch64-apple-ios", "aarch64-linux-android", "x86_64-apple-darwin", "x86_64-fuchsia", "x86_64-pc-windows-msvc", "x86_64-pc-solaris", "x86_64-unknown-illumos", "x86_64-unknown-linux-gnu", "x86_64-unknown-netbsd"]
     steps:
     - uses: actions/checkout@master
+    - uses: taiki-e/install-action@cargo-hack
     - name: Install Rust
       run: rustup update stable && rustup default stable
-    - name: Install cargo-hack
-      run: cargo install cargo-hack
     - name: Install Target
       run: rustup target add ${{ matrix.target }}
     - name: Run check
@@ -85,10 +83,9 @@ jobs:
         target: ["x86_64-unknown-redox"]
     steps:
     - uses: actions/checkout@master
+    - uses: taiki-e/install-action@cargo-hack
     - name: Install Rust nightly
       run: rustup update nightly && rustup default nightly
-    - name: Install cargo-hack
-      run: cargo install cargo-hack
     - name: Install Target
       run: rustup target add ${{ matrix.target }}
     - name: Run check