feat: Add extra secret manifests support (#515)

Adds a new template `extra-secret-manifests.yaml` and updates `values.schema.json` to allow users to define and deploy arbitrary Kubernetes Secret resources. This feature supports the injection of custom secrets and includes SOPS metadata for encrypted secrets.

Signed-off-by: Tejinder Singh <tsingh@clickup.com>
Co-authored-by: Rui Chen <rui@chenrui.dev>

Author: tejisin

charts/atlantis/templates/extra-secret-manifests.yaml

@@ -0,0 +1,4 @@
+{{- range .Values.extraSecretManifests }}
+---
+{{ tpl (toYaml .) $ }}
+{{- end }}

charts/atlantis/values.schema.json

@@ -1046,6 +1046,18 @@
         "type": "object"
       }
     },
+    "extraSecretManifests": {
+      "type": "array",
+      "description": "Add additional secret manifests to deploy",
+      "items": {
+        "type": "object"
+      }
+    },
+    "sops": {
+      "type": "object",
+      "description": "SOPS metadata for extra secret manifests",
+      "default": {}
+    },
     "initContainers": {
       "description": "Containers used to initialize context for Atlantis pods",
       "items": {