ENH Allow using .env file for github token (#240)

README.md

@@ -177,7 +177,7 @@ Cow includes commands to help synchronise standardised data to all
 * `cow github:ratelimit` Check your current GitHub API rate limiting status (sync commands can use this up quickly)
 
 **Note:** All GitHub API commands require a `GITHUB_ACCESS_TOKEN` environment variable to be set before they can be
-used.
+used. It can be in the .env file (see [dev mode](#dev_mode)).
 
 ### Labels
 

src/Steps/Release/PublishRelease.php

@@ -366,6 +366,9 @@ protected function getGithubClient(OutputInterface $output)
     protected function getOAUTHToken(OutputInterface $output)
     {
         $token = getenv('GITHUB_API_TOKEN');
+        if (empty($token)) {
+            $token = $_ENV['GITHUB_API_TOKEN'];
+        }
         if (empty($token)) {
             $token = Composer::getOAUTHToken($this->getCommandRunner($output));
         }

src/Utility/GitHubApi.php

@@ -28,13 +28,14 @@ class GitHubApi
     public function getClient()
     {
         if (!$this->client) {
+            $token = getenv(self::TOKEN_ENV_VAR) ?: $_ENV[self::TOKEN_ENV_VAR];
             // Handled here rather than constructor so that exceptions will be formatted by SymfonyStyle
-            if (!getenv(self::TOKEN_ENV_VAR)) {
+            if (!$token) {
                 throw new RuntimeException(self::TOKEN_ENV_VAR . ' environment variable is not defined!');
             }
 
             $this->client = new Client();
-            $this->client->authenticate(getenv(self::TOKEN_ENV_VAR), null, Client::AUTH_HTTP_TOKEN);
+            $this->client->authenticate($token, null, Client::AUTH_HTTP_TOKEN);
         }
         return $this->client;
     }