feat(argocd): configure git-age

argocd/.gitattributes

@@ -1 +1,2 @@
 **/values.*.yaml filter=age diff=age merge=age -text
+**/secret.*.yaml filter=age diff=age merge=age -text

argocd/kustomization.yaml

@@ -5,6 +5,8 @@ namespace: argo-system
 
 resources:
   - resources/namespace.yaml
+  - resources/secret.git-age.yaml
+  - resources/configmap.git.yaml
   - resources/dragonfly.yml
   - resources/http_routes.yaml
 

argocd/resources/configmap.git.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: git-config
+data:
+  gitconfig: |
+    [filter "lfs"]
+        process = git-lfs filter-process
+        required = true
+        clean = git-lfs clean -- %f
+        smudge = git-lfs smudge -- %f
+
+    [filter "age"]
+        clean = git-age clean -- %f
+        smudge = git-age smudge -- %f
+        required = true