Add CI job for Ubuntu 20.04 aarch64

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

.github/workflows/ci.yaml

@@ -15,7 +15,32 @@ jobs:
 
     steps:
     - name: Checkout bwa
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Compile with ${{ matrix.compiler }}
       run:  make CC=${{ matrix.compiler }}
+
+  build-aarch64:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [gcc, clang]
+
+    steps:
+    - name: Checkout bwa
+      uses: actions/checkout@v3
+
+    - name: Compile with ${{ matrix.compiler }}
+      uses: uraimo/run-on-arch-action@v2
+      with:
+        arch: aarch64
+        distro: ubuntu20.04
+        githubToken: ${{ github.token }}
+        dockerRunArgs: |
+          --volume "${PWD}:/bwa"
+        install: |
+          apt-get update -q -y
+          apt-get install -q -y make ${{ matrix.compiler }} zlib1g-dev
+        run: |
+          cd /bwa
+          make CC=${{ matrix.compiler }}