workflows: also test on Linux aarch64

It probably won't give meaningful additional CI coverage, but it doesn't
hurt either.

Signed-off-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>

Author: bgilbert

.github/workflows/java.yaml

@@ -18,7 +18,7 @@ jobs:
       dist-base: ${{ steps.dist.outputs.dist-base }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]
         java: [22, 23]
         include:
           - os: ubuntu-latest
@@ -37,7 +37,7 @@ jobs:
         java-version: ${{ matrix.java }}
         cache: maven
     - name: Install dependencies (Linux)
-      if: matrix.os == 'ubuntu-latest'
+      if: startsWith(matrix.os, 'ubuntu-')
       run: |
         sudo add-apt-repository "ppa:openslide/openslide"
         sudo apt-get install libopenslide1