Merge pull request #735 from resin-io/734-more-array-fields

feature(host_config): Support gpio config as an array

package.json

@@ -18,6 +18,7 @@
     "versionist": "versionist",
     "coverage": "istanbul report text && istanbul report html"
   },
+  "private": "true",
   "dependencies": {
     "mkfifo": "^0.1.5",
     "sqlite3": "^3.1.0"

src/config/backend.ts

@@ -76,6 +76,7 @@ export class RPiConfigBackend extends DeviceConfigBackend {
 		'dtoverlay',
 		'device_tree_param',
 		'device_tree_overlay',
+		'gpio',
 	];
 	private static forbiddenConfigKeys = [
 		'disable_commandline_tags',