feat: implement multi-provider architecture for contribution fetching and add Docker support

src/Service/GitHubProvider.php

@@ -11,19 +11,26 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
  *
  * Required token scopes: read:user
  */
-class GitHubProvider
+class GitHubProvider implements ProviderInterface
 {
     private const GRAPHQL_URL = 'https://api.github.com/graphql';
 
     public function __construct(
         private readonly HttpClientInterface $client,
         private readonly GraphQLApiClientRegistryInterface $registry,
+        private readonly string $username,
+        private readonly string $token,
     ) {}
 
+    public function isConfigured(): bool
+    {
+        return $this->username !== '' && $this->token !== '';
+    }
+
     /**
      * @return array<string, int>  date (Y-m-d) => contribution count
      */
-    public function fetch(string $username, string $token): array
+    public function fetch(): array
     {
         $from = (new \DateTimeImmutable('-365 days'))->format('Y-m-d\T00:00:00\Z');
         $to   = (new \DateTimeImmutable())->format('Y-m-d\T23:59:59\Z');
@@ -32,7 +39,7 @@ class GitHubProvider
         $graphqlClient = $this->registry->get('github');
 
         $query = $graphqlClient->buildQuery(
-            ['user' => ['login' => $username]],
+            ['user' => ['login' => $this->username]],
             [
                 'contributionsCollection' => [
                     '_parameters' => ['from' => $from, 'to' => $to],
@@ -49,7 +56,7 @@ class GitHubProvider
         // transport sends form_params, so we use Symfony HttpClient here instead.
         $response = $this->client->request('POST', self::GRAPHQL_URL, [
             'headers' => [
-                'Authorization' => "Bearer $token",
+                'Authorization' => "Bearer {$this->token}",
                 'Content-Type'  => 'application/json',
             ],
             'json' => ['query' => $query],