ci: Improve ubuntu_22_rust_msrv

Make the steps more deterministic by moving the Git checkout after all
dependencies are installed.

Signed-off-by: Mickaël Salaün <[email protected]>

.github/workflows/rust.yml

@@ -118,18 +118,21 @@ jobs:
       LANDLOCK_CRATE_TEST_ABI: 3
     steps:
 
-    - uses: actions/checkout@v4
-      with:
-        ref: ${{ matrix.commit }}
-
     - name: Clone Landlock test tools
       uses: actions/checkout@v4
       with:
         repository: landlock-lsm/landlock-test-tools
         ref: ${{ env.LANDLOCK_TEST_TOOLS_COMMIT }}
         path: landlock-test-tools
 
+    - name: Clone rust-landlock
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ matrix.commit }}
+        path: rust-landlock
+
     - name: Get MSRV
+      working-directory: rust-landlock
       run: sed -n 's/^rust-version = "\([0-9.]\+\)"$/RUST_TOOLCHAIN=\1/p' Cargo.toml >> $GITHUB_ENV
 
     - name: Install Rust MSRV
@@ -139,16 +142,20 @@ jobs:
         rustup update ${{ env.RUST_TOOLCHAIN }}
 
     - name: Build
+      working-directory: rust-landlock
       run: rustup run ${{ env.RUST_TOOLCHAIN }} cargo build --verbose
 
     - name: Build tests
+      working-directory: rust-landlock
       run: rustup run ${{ env.RUST_TOOLCHAIN }} cargo build --tests --verbose
 
     - name: Run tests against the local kernel (Landlock ABI ${{ env.LANDLOCK_CRATE_TEST_ABI }})
+      working-directory: rust-landlock
       run: rustup run ${{ env.RUST_TOOLCHAIN }} cargo test --verbose
 
     - name: Run tests against Linux 6.1
-      run: CARGO="rustup run ${{ env.RUST_TOOLCHAIN }} cargo" ./landlock-test-tools/test-rust.sh linux-6.1 2
+      working-directory: rust-landlock
+      run: CARGO="rustup run ${{ env.RUST_TOOLCHAIN }} cargo" ../landlock-test-tools/test-rust.sh linux-6.1 2
 
   ubuntu_20_rust_stable:
     runs-on: ubuntu-20.04