Update README.md with Docker build and Kubernetes debug instructions

- Added instructions for building and pushing Docker images with specific tags.
- Included steps for creating Kubernetes secrets from local .env files.
- Provided guidance on manually creating and removing a debug pod in Kubernetes.

k8s/debug-pod.yaml

@@ -0,0 +1,43 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: ncore-hnr-debug
+  namespace: media-server
+  labels:
+    app.kubernetes.io/name: ncore-hnr-debug
+spec:
+  restartPolicy: Never
+  securityContext:
+    fsGroup: 65532
+  containers:
+    - name: ncore-hnr-debug
+      image: alfonzso/ncore-hnr-debug:latest
+      imagePullPolicy: Always
+      command: ["sh", "-c", "sleep infinity"]
+      envFrom:
+        - secretRef:
+            name: ncore-hnr-secrets
+      env:
+        - name: QBITTORRENT_URL
+          value: http://ms-qbittorrent
+        - name: APP_DB_PATH
+          value: /data/ncore-hnr.sqlite
+        - name: DRY_RUN
+          value: "true"
+        - name: NOTIFICATION_DRY_RUN
+          value: "true"
+      resources:
+        requests:
+          cpu: 50m
+          memory: 64Mi
+        limits:
+          cpu: 250m
+          memory: 256Mi
+      volumeMounts:
+        - name: data
+          mountPath: /data
+  volumes:
+    - name: data
+      hostPath:
+        path: /mnt/secure/flux-at-home/ncore-hnr/data
+        type: DirectoryOrCreate