Add validatorVersion on API responses

Return git hash on netlify, based on COMMIT_REF env variable or package.json's version
Close #77

gbfs-validator/gbfs.js

@@ -1,5 +1,6 @@
 const got = require('got')
 const validate = require('./validate')
+const validatorVersion = require('./package.json').version
 
 function hasErrors(data, required) {
   let hasError = false
@@ -424,6 +425,9 @@ class GBFS {
     if (!gbfsResult.version) {
       return {
         summary: {
+          validatorVersion: process.env.COMMIT_REF
+            ? process.env.COMMIT_REF.substring(0, 7)
+            : validatorVersion,
           versionUnimplemented: true
         }
       }
@@ -566,6 +570,9 @@ class GBFS {
 
     return {
       summary: {
+        validatorVersion: process.env.COMMIT_REF
+          ? process.env.COMMIT_REF.substring(0, 7)
+          : validatorVersion,
         version: {
           detected: result[0].version,
           validated: this.options.version || result[0].version

netlify.toml

@@ -2,3 +2,8 @@
   command = "yarn build"
   publish = "dist/website"
   functions = "dist/functions"
+
+[[plugins]]
+package = "netlify-plugin-inline-functions-env"
+  [plugins.inputs]
+  buildEvent = "onBuild"