update CI to also run tests on aarch64

Author: zaidoon1

.github/workflows/rust.yml

@@ -63,10 +63,12 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        build: [Linux, macOS, Windows]
+        build: [Linux_x86, Linux_aarch64, macOS, Windows]
         include:
-          - build: Linux
+          - build: Linux_x86
             os: ubuntu-latest
+          - build: Linux_aarch64
+            os: ubuntu-20.04-arm
           - build: macOS
             os: macos-latest
           - build: Windows