Configure ArgoCD for private repo access

- Update repo URLs from HTTPS placeholder to git@github.com:lazorgurl/homelab.git
- Update container image refs from OWNER to lazorgurl
- Set KUBECONFIG env in Taskfile
- Fix kubeconfig-fetch.sh to auto-detect server IP from inventory
- Fix Ansible: callback plugin, br_netfilter ordering, ssh service name

infra/kubernetes/argocd/appsets/previews.yaml

@@ -9,7 +9,7 @@ spec:
   generators:
     - pullRequest:
         github:
-          owner: OWNER
+          owner: lazorgurl
           repo: homelab
         requeueAfterSeconds: 60
   template:
@@ -18,7 +18,7 @@ spec:
     spec:
       project: default
       source:
-        repoURL: https://github.com/OWNER/homelab.git
+        repoURL: git@github.com:lazorgurl/homelab.git
         targetRevision: "{{ .branch }}"
         path: apps/*/k8s/overlays/preview
         kustomize: