TEMP COMMIT: Run aarch64 tests in try builds

Author: Enselic

src/ci/github-actions/jobs.yml

@@ -98,10 +98,8 @@ pr:
 # These jobs automatically inherit envs.try, to avoid repeating
 # it in each job definition.
 try:
-  - image: dist-x86_64-linux
-    env:
-      CODEGEN_BACKENDS: llvm,cranelift
-    <<: *job-linux-16c
+  - image: aarch64-gnu
+    <<: *job-aarch64-linux
 
 # Main CI jobs that have to be green to merge a commit into master
 # These jobs automatically inherit envs.auto, to avoid repeating