Initialize git-contribution-graph project with Docker setup, environment configuration, and core functionality for merging contributions from GitHub, GitLab, and Gitea into an SVG heatmap.

config/bundles.php

@@ -0,0 +1,5 @@
+<?php
+
+return [
+    Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
+];

config/packages/framework.yaml

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+framework:
+    secret: '%env(APP_SECRET)%'
+    http_method_override: false
+    handle_all_throwables: true
+    php_errors:
+        log: true
+    cache:
+        app: cache.adapter.filesystem
+        default_redis_provider: 'redis://localhost'

config/routes.yaml

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+controllers:
+    resource:
+        path: ../src/Controller/
+        namespace: App\Controller
+    type: attribute