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/release-build.yml

@@ -42,7 +42,6 @@ jobs:
     - uses: actions/checkout@v3
     - uses: ./.github/actions/just-setup
       with:
-        tools: cross
         cache-suffix: release-${{ matrix.t }}
 
     - run: just toolchain rust-src
@@ -87,7 +86,8 @@ jobs:
     - uses: actions/checkout@v3
     - uses: ./.github/actions/just-setup
       with:
-        cache: false
+        index-cache: false
+        build-cache: false
 
     - uses: actions/download-artifact@v3
       with: