Add example deployment for Flux

docs/examples/README.md

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+# Example deployments
+
+Examples of how to deploy SMSBot.
+
+* [Flux HelmRelease](flux-helmrelease.yaml) - An example Flux `HelmRelease` using a common chart for basic deployment.

docs/examples/flux-helmrelease.yaml

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+---
+# yaml-language-server: $schema=https://nikdoof.github.io/flux-gitops/schemas/source.toolkit.fluxcd.io/helmrepository_v1.json
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: HelmRepository
+metadata:
+  name: nikdoof
+  namespace: flux-system
+spec:
+  interval: 4h
+  url: https://nikdoof.github.io/helm-charts/
+---
+# yaml-language-server: $schema=https://nikdoof.github.io/flux-gitops/schemas/helm.toolkit.fluxcd.io/helmrelease_v2.json
+apiVersion: helm.toolkit.fluxcd.io/v2
+kind: HelmRelease
+metadata:
+  name: smsbot
+spec:
+  interval: 12h
+  chart:
+    spec:
+      chart: common-chart
+      version: 1.2.3
+      sourceRef:
+        kind: HelmRepository
+        name: nikdoof
+        namespace: flux-system
+      interval: 12h
+  values:
+    global:
+      nameOverride: smsbot
+    image:
+      repository: ghcr.io/nikdoof/smsbot
+      tag: 0.2.0
+      imagePullPolicy: IfNotPresent
+    controller:
+      strategy: Recreate
+      annotations:
+        secret.reloader.stakater.com/reload: "smsbot-secrets"
+    envFrom:
+      - secretRef:
+          name: smsbot-secrets
+    service:
+      main:
+        ports:
+          http:
+            port: 5000
+    ingress:
+      main:
+        enabled: true
+        hosts:
+          - host: smsbot-webhooks.example.com
+            paths:
+              - path: /
+                pathType: Prefix
+