Setup flux image update policies

clusters/prod/image-policies.yaml

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+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImagePolicy
+metadata:
+  name: app-policy
+spec:
+  policy:
+    pinDigests: true
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImagePolicy
+metadata:
+  name: postgresql
+  namespace: gitea
+spec:
+  imageRepositoryRef:
+    name: postgresql
+  policy:
+    semver:
+      range: '>=15.3.0 <16.0.0'
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImagePolicy
+metadata:
+  name: lemma
+  namespace: lemma
+spec:
+  imageRepositoryRef:
+    name: lemma
+  policy:
+    semver:
+      range: '>=0.4.1 <1.0.0'
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImagePolicy
+metadata:
+  name: k9s-web
+  namespace: k9s
+spec:
+  imageRepositoryRef:
+    name: k9s-web
+  policy:
+    semver:
+      range: '>=0.4.0 <1.0.0'
+---

clusters/prod/image-registries.yaml

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+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImageRepository
+metadata:
+  name: postgresql
+  namespace: gitea
+spec:
+  image: docker.io/bitnami/postgresql
+  interval: 1h
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImageRepository
+metadata:
+  name: lemma
+  namespace: lemma
+spec:
+  image: ghcr.io/lordmathis/lemma
+  interval: 5m
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImageRepository
+metadata:
+  name: k9s-web
+  namespace: k9s
+spec:
+  image: ghcr.io/lordmathis/k9s-web
+  interval: 5m
+---