feat(flux): add docs-site ImageRepository, ImagePolicy, and setter marker

Closes leeworks-agents/api-company#85

- Add ImageRepository 'docs-site' in flux-system watching
  registry.leeworks.dev/leeworks-agents/docs-site (5m poll interval)
- Add ImagePolicy 'docs-site' in flux-system using alphabetical/asc
  ordering (consistent with SHA-tag CI pushes)
- Add $imagepolicy setter marker comment to flux/docs-site/helmrelease.yaml
  so Flux ImageUpdateAutomation can auto-commit new image tags

kustomize build flux/ = PASS

flux/docs-site/helmrelease.yaml

@@ -35,7 +35,7 @@ spec:
                 - name: gitea-registry
               containers:
                 - name: docs-site
-                  image: registry.leeworks.dev/leeworks-agents/docs-site:latest
+                  image: registry.leeworks.dev/leeworks-agents/docs-site:latest # {"$imagepolicy": "flux-system:docs-site"}
                   ports:
                     - containerPort: 80
                   resources:

flux/image-automation/imagepolicies.yaml

@@ -37,3 +37,15 @@ spec:
   policy:
     semver:
       range: ">=0.1.0"
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImagePolicy
+metadata:
+  name: docs-site
+  namespace: flux-system
+spec:
+  imageRepositoryRef:
+    name: docs-site
+  policy:
+    alphabetical:
+      order: asc

flux/image-automation/imagerepositories.yaml

@@ -32,3 +32,14 @@ spec:
   interval: 5m
   secretRef:
     name: gitea-leeworks-agents-token
+---
+apiVersion: image.toolkit.fluxcd.io/v1beta2
+kind: ImageRepository
+metadata:
+  name: docs-site
+  namespace: flux-system
+spec:
+  image: registry.leeworks.dev/leeworks-agents/docs-site
+  interval: 5m
+  secretRef:
+    name: gitea-leeworks-agents-token