Run alloy-tracing as root for eBPF capabilities

The nix-built Alloy image sets User=65534 (nobody). Even with
privileged: true, a non-root user gets no effective capabilities
(CapEff=0). Override with runAsUser: 0 so Beyla gets CAP_BPF and
CAP_SYS_ADMIN needed for eBPF instrumentation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/manifests/alloy-tracing-ringtail/daemonset.yaml

@@ -46,6 +46,7 @@ spec:
               mountPath: /var/lib/alloy/data
           securityContext:
             privileged: true
+            runAsUser: 0
       tolerations:
         - operator: Exists
       volumes: