buck2/github: simplify Windows and Mac setup

Summary:
Current setup steps are copied from CirleCI, Github allows to do this easier and faster.

`setup_windows_env` **3m12s** -> **46s**: https://github.com/KapJI/buck2/actions/runs/11840491142/job/32994456976

* Use `dtolnay/rust-toolchain` on all platforms. It also configures Cargo a bit, e.g. enabled coloured output.
* `rustup` is already installed on Windows runners: https://github.com/actions/runner-images/blob/main/images/windows/Windows2022-Readme.md#rust-tools
* `actions/checkout` is performed on job level, these actions are duplicated.

Differential Revision: D66010956

.github/actions/setup_linux_env/action.yml

@@ -25,7 +25,6 @@ runs:
   - name: Install conan
     run: sudo pip3 install conan==1.*
     shell: bash
-  - uses: actions/checkout@v4
   - uses: actions/setup-go@v5
     with:
       go-version: '~1.22.0'

.github/actions/setup_macos_env/action.yml

@@ -3,17 +3,22 @@ description: Setup macOS environment
 runs:
   using: composite
   steps:
-  - name: Install Rustup
-    run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=none
-    shell: bash
+  - uses: SebRollen/[email protected]
+    id: read_rust_toolchain
+    with:
+      file: rust-toolchain
+      field: toolchain.channel
+  - uses: dtolnay/rust-toolchain@v1
+    with:
+      toolchain: ${{ steps.read_rust_toolchain.outputs.value }}
+      components: clippy
   - name: Brew install
     run: brew install cmake python3 coreutils opam llvm protobuf zstd
     shell: bash
   - name: Install conan
     run: sudo pip3 install --break-system-packages conan==1.*
     shell: bash
   - uses: "./.github/actions/print_versions"
-  - uses: actions/checkout@v4
   - uses: actions/setup-go@v5
     with:
       go-version: '~1.22.0'

.github/actions/setup_windows_env/action.yml

@@ -3,29 +3,25 @@ description: Setup Windows environment for building and testing
 runs:
   using: composite
   steps:
-  - name: Install Rustup
-    run: |-
-      choco install -y rustup.install
-      write-output "[net]`ngit-fetch-with-cli = true" | out-file -append -encoding utf8 $Env:USERPROFILE/.cargo/config.toml
-      type $Env:USERPROFILE/.cargo/config.toml
-    shell: pwsh
-  - name: Create python3 symlink
-    run: New-Item -ItemType SymbolicLink -Path C:\ProgramData\chocolatey\bin\python3.exe -Target $(Get-Command python).Source
     shell: pwsh
-  - name: Write Powershell profile
+  - name: Write Visual Studio path
     run: |-
-      $psProfileContent = @'
       $vsPath = & "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -requires Microsoft.VisualStudio.Component.VC.Llvm.Clang -property installationPath
-      $llvmPath = Join-Path $vsPath "VC\Tools\Llvm\x64\bin"
-      $env:PATH = "$env:USERPROFILE\.cargo\bin;$llvmPath;" + $env:PATH
-      $env:TEMP = "$env:USERPROFILE\temp"
-      $env:TMP = $env:TEMP
-      '@
-      Add-Content "$PsHome\profile.ps1" $psProfileContent
-      New-Item -ItemType Directory -Path "$env:USERPROFILE\temp"
+      Join-Path $vsPath "VC\Tools\Llvm\x64\bin" | Out-File -FilePath $env:GITHUB_PATH -Append
     shell: pwsh
-  - uses: "./.github/actions/print_versions"
-  - uses: actions/checkout@v4
+  - name: Create python3 symlink
+    run: |
+      New-Item -ItemType SymbolicLink -Path C:\ProgramData\chocolatey\bin\python3.exe -Target $(Get-Command python).Source
+    shell: pwsh
+  - uses: SebRollen/[email protected]
+    id: read_rust_toolchain
+    with:
+      file: rust-toolchain
+      field: toolchain.channel
+  - uses: dtolnay/rust-toolchain@v1
+    with:
+      toolchain: ${{ steps.read_rust_toolchain.outputs.value }}
+      components: clippy
   - uses: actions/setup-go@v5
     with:
       go-version: '~1.22.0'

.github/workflows/build-and-test.yml

@@ -83,11 +83,5 @@ jobs:
           & $Env:RUNNER_TEMP/artifacts/buck2 build //... -v 2
           & $Env:RUNNER_TEMP/artifacts/buck2 test //... -v 2
       - uses: ./.github/actions/build_example_no_prelude
-      - name: Configure CARGO_HOME
-        run: |-
-          echo CARGO_HOME=$GITHUB_WORKSPACE/.cargo >> $GITHUB_ENV
-          echo $GITHUB_WORKSPACE/.cargo/bin >> $GITHUB_PATH
-        shell:
-          bash
       - uses: ./.github/actions/setup_reindeer
       - uses: ./.github/actions/build_bootstrap