add source code and readme

manifests/applications/mastodon/elasticsearch-secret.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: mastodon-elasticsearch-credentials
+    namespace: mastodon-application
+type: Opaque
+stringData:
+    # Elasticsearch password for Mastodon
+    # The Mastodon Helm chart expects a 'password' key in this secret
+    # Username is specified in helm-release.yaml as elasticsearch.user
+    password: <secret>
+