Add apt retries alongside IPv4 force in aarch64 Setup OS

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: jbachorik

.github/workflows/test_workflow.yml

@@ -388,8 +388,9 @@ jobs:
         if: steps.set_enabled.outputs.enabled == 'true'
         run: |
           # ports.ubuntu.com's IPv6 route is intermittently unreachable from GH-hosted
-          # aarch64 runners; force IPv4 so apt doesn't stall/fail on a dead IPv6 path.
-          echo 'Acquire::ForceIPv4 "true";' | sudo tee /etc/apt/apt.conf.d/99force-ipv4 >/dev/null
+          # aarch64 runners; force IPv4 so apt doesn't stall/fail on a dead IPv6 path,
+          # and retry on top in case of other transient connection blips.
+          printf 'Acquire::ForceIPv4 "true";\nAcquire::Retries "5";\n' | sudo tee /etc/apt/apt.conf.d/99force-ipv4 >/dev/null
           sudo apt update -y
           sudo apt remove -y g++
           sudo apt autoremove -y