Revert "remove old impl of cert-manager"

This reverts commit 771f4df8dd.

kubernetes/apps/cert-manager-old/cert-manager.yaml

@@ -0,0 +1,65 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: cert-manager-secrets
+  namespace: flux-system
+spec:
+  suspend: true
+  interval: 1h
+  path: ./cert-manager
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    namespace: flux-system
+    name: home-cluster-ops-secrets
+  dependsOn:
+    - name: repositories
+      namespace: flux-system
+    - name: cert-manager
+      namespace: flux-system
+  decryption:
+    provider: sops
+    secretRef:
+      name: sops-age
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: cert-manager
+  namespace: flux-system
+spec:
+  suspend: true
+  interval: 1h
+  targetNamespace: cert-manager
+  path: ./kubernetes/templates/apps/cert-manager/app
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    namespace: flux-system
+    name: flux-system
+  postBuild:
+    substituteFrom:
+      - kind: Secret
+        name: cert-manager-secrets
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: cert-manager-issuers
+  namespace: flux-system
+spec:
+  suspend: true
+  interval: 1h
+  targetNamespace: cert-manager
+  path: ./kubernetes/templates/apps/cert-manager/issuers
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    namespace: flux-system
+    name: flux-system
+  dependsOn:
+    - name: cert-manager-secrets
+  postBuild:
+    substituteFrom:
+      - kind: Secret
+        name: cert-manager-secrets