k8s/arc: set RUNNER_ALLOW_RUNASROOT

Author: ttrssreal

k8s/github-runners/scale-set.yaml

@@ -19,6 +19,9 @@ spec:
               containers:
                 - name: runner
                   image: ghcr.io/ttrssreal/runner-image:2652739d391ebaed2cff5f1713669906ad0878b7
+                  env:
+                    - name: RUNNER_ALLOW_RUNASROOT
+                      value: "true"
                   command: ["/home/runner/run.sh"]
           githubConfigUrl: "https://github.com/ttrssreal/jix"
           # FIXME: part of declarative secret management