create nats-upload action

action.yml

@@ -0,0 +1,42 @@
+name: 'NATS Upload'
+description: 'Upload binaries to NATS Object Store for self-update'
+inputs:
+  nats_url:
+    description: 'NATS server URL'
+    required: true
+    default: 'nats://localhost:4222'
+  bucket:
+    description: 'Object store bucket name'
+    required: true
+    default: 'binaries'
+  source:
+    description: 'Directory containing binaries to upload'
+    required: true
+    default: 'upload'
+  strip_prefix:
+    description: 'Prefix to strip from paths'
+    required: false
+    default: ''
+  binary:
+    description: 'Binary name (defaults to first binary found)'
+    required: false
+    default: ''
+  notify_topic:
+    description: 'NATS topic to publish update notification'
+    required: false
+    default: 'binaries.update'
+  skip_notify:
+    description: 'Skip publishing update notification'
+    required: false
+    default: 'false'
+  cleanup:
+    description: 'Keep only N most recent versions (0 disables cleanup)'
+    required: false
+    default: '0'
+  cleanup_all:
+    description: 'Cleanup all binaries, not just current one'
+    required: false
+    default: 'false'
+runs:
+  using: 'go'
+  main: 'main.go'