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/actions/just-setup/action.yml

@@ -4,8 +4,13 @@ inputs:
     description: Extra tools
     required: false
     default: ""
-  cache:
-    description: Enable caches
+  index-cache:
+    description: Enable index cache
+    required: true
+    default: true
+    type: boolean
+  build-cache:
+    description: Enable build cache
     required: true
     default: true
     type: boolean
@@ -27,7 +32,7 @@ runs:
     with:
       tool: just,${{ inputs.tools }}
 
-  - if: inputs.cache
+  - if: inputs.index-cache
     name: Configure index cache
     uses: actions/cache@v3
     with:
@@ -40,10 +45,18 @@ runs:
         ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}-
         ${{ runner.os }}-cargo-index-
 
-  - if: inputs.cache
+  - name: Install rust toolchains
+    run: just toolchain
+    shell: bash
+
+  - name: rustc version
+    run: rustc -vV | tee /tmp/rustc-version
+    shell: bash
+
+  - if: inputs.build-cache
     name: Configure build cache
     uses: actions/cache@v3
     with:
       path: |
         target/
-      key: ${{ runner.os }}-cargo-build-${{ hashFiles('**/Cargo.lock') }}-${{ inputs.cache-suffix }}
+      key: ${{ runner.os }}-cargo-build-${{ hashFiles('/tmp/rustc-version') }}-${{ hashFiles('**/Cargo.lock') }}-${{ inputs.cache-suffix }}