Add ArgoCD PostSync hook for Harbor robot accounts

Manages robot accounts declaratively via GitOps:
- tekton-builder: push/pull access for CI/CD pipelines
- fastpass-cluster: pull-only access for K8s image pulls

Implementation:
- Kubernetes Job with argocd.argoproj.io/hook: PostSync annotation
- Idempotent: checks if accounts exist before creating
- Uses harbor-credentials ExternalSecret for admin password
- BeforeHookCreation deletion policy for clean reruns

Replaces manual robot account creation via Harbor API.

cluster/platform/harbor/robot-accounts-sync.yaml

@@ -0,0 +1,87 @@
+---
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: harbor-robot-accounts-sync
+  namespace: harbor
+  annotations:
+    argocd.argoproj.io/hook: PostSync
+    argocd.argoproj.io/hook-delete-policy: BeforeHookCreation
+spec:
+  template:
+    metadata:
+      name: harbor-robot-accounts-sync
+    spec:
+      restartPolicy: Never
+      serviceAccountName: default
+      containers:
+      - name: sync-robot-accounts
+        image: curlimages/curl:latest
+        command:
+        - /bin/sh
+        - -c
+        - |
+          set -e
+          
+          HARBOR_URL="https://the-seas.local.mk-labs.cloud/api/v2.0"
+          ADMIN_USER="admin"
+          ADMIN_PASSWORD="$(cat /secrets/admin-password)"
+          
+          echo "Syncing Harbor robot accounts..."
+          
+          # Function to check if robot account exists
+          robot_exists() {
+            local robot_name="$1"
+            curl -k -s -u "${ADMIN_USER}:${ADMIN_PASSWORD}" \
+              "${HARBOR_URL}/robots?q=name=${robot_name}" | grep -q "\"name\":\"robot\$${robot_name}\""
+          }
+          
+          # Function to create robot account
+          create_robot() {
+            local name="$1"
+            local description="$2"
+            local permissions="$3"
+            
+            echo "Creating robot account: ${name}"
+            curl -k -s -u "${ADMIN_USER}:${ADMIN_PASSWORD}" \
+              -X POST "${HARBOR_URL}/robots" \
+              -H "Content-Type: application/json" \
+              -d "{
+                \"name\": \"${name}\",
+                \"description\": \"${description}\",
+                \"duration\": -1,
+                \"level\": \"system\",
+                \"permissions\": ${permissions}
+              }" || echo "Failed to create ${name}"
+          }
+          
+          # Tekton Builder - Push/Pull access
+          if ! robot_exists "tekton-builder"; then
+            create_robot "tekton-builder" \
+              "Tekton CI/CD pipeline robot account with push/pull access" \
+              '[{"kind":"project","namespace":"*","access":[{"resource":"repository","action":"push"},{"resource":"repository","action":"pull"},{"resource":"artifact","action":"read"},{"resource":"artifact","action":"list"}]}]'
+          else
+            echo "Robot account tekton-builder already exists"
+          fi
+          
+          # Fastpass Cluster - Pull-only access
+          if ! robot_exists "fastpass-cluster"; then
+            create_robot "fastpass-cluster" \
+              "Fastpass Kubernetes cluster robot account with pull-only access" \
+              '[{"kind":"project","namespace":"*","access":[{"resource":"repository","action":"pull"},{"resource":"artifact","action":"read"},{"resource":"artifact","action":"list"}]}]'
+          else
+            echo "Robot account fastpass-cluster already exists"
+          fi
+          
+          echo "Robot accounts sync complete"
+        volumeMounts:
+        - name: admin-credentials
+          mountPath: /secrets
+          readOnly: true
+      volumes:
+      - name: admin-credentials
+        secret:
+          secretName: harbor-credentials
+          items:
+          - key: HARBOR_ADMIN_PASSWORD
+            path: admin-password