k8s/ci-cd: add forgejo gitops and argocd deployment

- Forgejo git forge + OCI registry
- Argo CD pull-based GitOps
- Private CA TLS (self-signed 10-year cert)
- Machine credentials scoped to repositories

k8s/talos-ci-cd/charts/forgejo-runner/templates/networkpolicy.yaml

@@ -0,0 +1,31 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: {{ .Release.Name }}-egress
+  namespace: {{ .Release.Namespace }}
+spec:
+  podSelector:
+    matchLabels:
+      app: {{ .Release.Name }}
+  policyTypes: [Egress]
+  egress:
+    # Forgejo — same cicd namespace (git push, registry push/pull)
+    - to:
+        - podSelector: {}
+    # CoreDNS
+    - to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+      ports:
+        - protocol: UDP
+          port: 53
+        - protocol: TCP
+          port: 53
+    # Internet (action deps, base images) — never LAN or pod network
+    - to:
+        - ipBlock:
+            cidr: 0.0.0.0/0
+            except:
+              - 192.168.1.0/24
+              - 10.244.0.0/16