ci: Test with all meaningful kernels thanks to landlock-test-tools

Test all Landlock ABI versions:
- Linux 5.10: no Landlock support
- Linux 5.15: ABI v1
- Linux 6.1: ABI v2

See https://github.com/landlock-lsm/landlock-test-tools

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

.github/workflows/rust.yml

@@ -118,6 +118,7 @@ jobs:
         commit: ${{ fromJSON(needs.commit_list.outputs.commits) }}
     env:
       LANDLOCK_CRATE_TEST_ABI: 1
+      CARGO: rustup run stable cargo
     steps:
     - name: Install Rust stable
       run: |
@@ -129,5 +130,22 @@ jobs:
       with:
         ref: ${{ matrix.commit }}
 
-    - name: Run tests
+    - name: Run tests against the local kernel (Landlock ABI ${{ env.LANDLOCK_CRATE_TEST_ABI }})
       run: rustup run stable cargo test --verbose
+
+    - name: Clone Landlock test tools
+      uses: actions/checkout@v3
+      with:
+        repository: landlock-lsm/landlock-test-tools
+        path: landlock-test-tools
+        fetch-depth: 0
+        ref: test
+
+    - name: Run tests against Linux 5.10
+      run: ./landlock-test-tools/test-rust.sh linux-5.10 0
+
+    - name: Run tests against Linux 5.15
+      run: ./landlock-test-tools/test-rust.sh linux-5.15 1
+
+    - name: Run tests against Linux 6.1
+      run: ./landlock-test-tools/test-rust.sh linux-6.1 2