Test out adding an arm64 runner

Not sure exactly how to do this, guessing based on
https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories

.github/workflows/linux-cpp.yml

@@ -5,8 +5,7 @@ on:
   push:
 
 jobs:
-  build:
-
+  x86_linux:
     runs-on: ubuntu-latest
 
     steps:
@@ -28,3 +27,26 @@ jobs:
             ./*
             test/* 
         retention-days: 14
+
+  x86_linux_arm:
+    runs-on: ubuntu-24.04-arm
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: prerequisites
+      run: |
+          sudo apt-get update
+          sudo apt-get install -y ncbi-blast+
+    - name: make
+      run: make
+    - name: test
+      run: ./test_stxtyper.sh
+    - name: Upload artifacts on failure
+      uses: actions/upload-artifact@v4
+      if: ${{ failure() }} # only run if the job fails
+      with: 
+        name: stxtyper-failed-test-linux
+        path: |
+            ./*
+            test/* 
+        retention-days: 14