fix: don't overwrite plugin origin if it exists (#5793)

* fix: don't overwrite plugin origin if it exists

* test: update snapshots (order of fields)

packages/build/tests/plugins/snapshots/tests.js.md

@@ -2682,7 +2682,7 @@ Generated by [AVA](https://avajs.dev).
     -> inputs: { some_input: 'some string' }␊
     -> netlifyConfig: {␊
       functions: { '*': {} },␊
-      plugins: [ { package: './plugin', origin: 'config', inputs: [Object] } ],␊
+      plugins: [ { origin: 'config', package: './plugin', inputs: [Object] } ],␊
       build: {␊
         environment: {},␊
         publish: 'packages/build/tests/plugins/fixtures/dynamic_plugin',␊

packages/config/src/origin.js

@@ -26,7 +26,7 @@ const addBuildPublishOrigin = function ({ config, config: { build = {} }, origin
 }
 
 const addConfigPluginOrigin = function ({ config, config: { plugins }, origin }) {
-  return Array.isArray(plugins) ? { ...config, plugins: plugins.map((plugin) => ({ ...plugin, origin })) } : config
+  return Array.isArray(plugins) ? { ...config, plugins: plugins.map((plugin) => ({ origin, ...plugin })) } : config
 }
 
 const addHeadersOrigin = function ({ config, config: { headers }, origin }) {

packages/config/tests/validate/snapshots/tests.js.md

@@ -71,8 +71,8 @@ Generated by [AVA](https://avajs.dev).
     Invalid syntax␊
     ␊
       [[plugins]]␊
-      test = true␊
       origin = "config"␊
+      test = true␊
     ␊
         [plugins.inputs]␊
     ␊
@@ -97,8 +97,8 @@ Generated by [AVA](https://avajs.dev).
     Invalid syntax␊
     ␊
       [[plugins]]␊
-      id = "test"␊
       origin = "config"␊
+      id = "test"␊
     ␊
         [plugins.inputs]␊
     ␊
@@ -123,9 +123,9 @@ Generated by [AVA](https://avajs.dev).
     Invalid syntax␊
     ␊
       [[plugins]]␊
+      origin = "config"␊
       package = "./plugin.js"␊
       enabled = true␊
-      origin = "config"␊
     ␊
         [plugins.inputs]␊
     ␊