feat(k8s): add K8s manifests for all homelab services

traefik, gitea, adguard, nextcloud, errorpages, homepages,
uptime-kuma, kener, checkmk, headscale, dockmon, metube,
downtify, portainer, netronome, userbot

Includes Helm values, deployments, services, ingress routes,
configmaps, secrets (placeholders), postgres statefulsets,
kustomize overlays, and Traefik dynamic configuration.

checkmk/k8s/checkmk.yaml

@@ -0,0 +1,71 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: checkmk-service
+  namespace: checkmk
+spec:
+  selector:
+    app: checkmk
+  ports:
+  - port: 5000
+    targetPort: 5000
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: checkmk-deployment
+  namespace: checkmk
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: checkmk
+  template:
+    metadata:
+      labels:
+        app: checkmk
+    spec:
+      containers:
+      - name: checkmk
+        image: checkmk/check-mk-raw:2.4.0-latest
+        envFrom:
+        - secretRef:
+            name: checkmk-secrets
+        env:
+        - name: CMK_SITE_ID
+          value: "cmk"
+        - name: TZ
+          value: "Etc/UTC"
+        ports:
+        - containerPort: 5000
+        volumeMounts:
+        - name: sites
+          mountPath: /omd/sites
+        - name: tmp
+          mountPath: /opt/omd/sites/cmk/tmp
+        resources:
+          requests:
+            memory: "1Gi"
+            cpu: "1"
+          limits:
+            memory: "5Gi"
+            cpu: "4"
+      volumes:
+      - name: sites
+        persistentVolumeClaim:
+          claimName: checkmk-sites-pvc
+      - name: tmp
+        emptyDir:
+          medium: Memory
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: checkmk-sites-pvc
+  namespace: checkmk
+spec:
+  accessModes:
+  - ReadWriteOnce
+  resources:
+    requests:
+      storage: 5Gi

checkmk/k8s/ingress.yaml

@@ -0,0 +1,50 @@
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: checkmk-prod
+  namespace: checkmk
+spec:
+  entryPoints:
+    - websecure
+  routes:
+  - match: Host(`cmk.forust.xyz`)
+    kind: Rule
+    services:
+    - name: checkmk-service
+      port: 5000
+  tls:
+    {}
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: checkmk-local
+  namespace: checkmk
+spec:
+  entryPoints:
+    - websecure
+  routes:
+  - match: Host(`cmk.workstation.internal`)
+    kind: Rule
+    services:
+    - name: checkmk-service
+      port: 5000
+  tls:
+    secretName: local-tls
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: checkmk-dev
+  namespace: checkmk
+spec:
+  entryPoints:
+    - websecure
+  routes:
+  - match: Host(`cmk.gigaforust.internal`)
+    kind: Rule
+    services:
+    - name: checkmk-service
+      port: 5000
+  tls:
+    secretName: local-tls

checkmk/k8s/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: checkmk