Speedup CI (#842)

- Remove `tools: cross` input to `actions/just-setup`
    since we use `cargo-zigbuild` for cross compiling instead of `cross-rs`
    now.
 - Only install `cargo-zigbuild` in `just ci-install-deps` if `JUST_USE_CARGO_ZIGBUILD` is enabled
 - Include hash of `rustc -vV` in `build-cache`
    Switching between different versions of `rustc` will cause all crates to be
    rebuilt using new `rustc`.
 - Replace input `cache` with `index-cache` and `build-cache` in `actions/just-setup`
    for better control of caching behavior
 -  Reuse workflow `test`'s `build-cache` in workflow `lint`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

.github/workflows/ci.yml

@@ -53,7 +53,6 @@ jobs:
       with:
         cache-suffix: ${{ env.CARGO_BUILD_TARGET }}
 
-    - run: just toolchain
     - run: just ci-install-deps
     - run: just test
       env:
@@ -78,10 +77,8 @@ jobs:
     - uses: actions/checkout@v3
     - uses: ./.github/actions/just-setup
       with:
-        tools: cross
         cache-suffix: ${{ env.CARGO_BUILD_TARGET }}
 
-    - run: just toolchain
     - run: just ci-install-deps
     - run: just check
 
@@ -96,19 +93,26 @@ jobs:
       with:
         cache-suffix: ${{ env.CARGO_BUILD_TARGET }}
 
-    - run: just toolchain
     - run: just check
 
   lint:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        include:
+          - target: x86_64-apple-darwin
+            os: macos-latest
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+          - target: x86_64-pc-windows-msvc
+            os: windows-latest
 
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
     - uses: ./.github/actions/just-setup
+      with:
+        cache-suffix: ${{ matrix.target }}
 
     - run: just toolchain rustfmt,clippy
     - run: just ci-install-deps