Created new env var to programatically provide an initial API key

module/Rest/src/ApiKey/Repository/ApiKeyRepository.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Rest\ApiKey\Repository;
+
+use Doctrine\DBAL\LockMode;
+use Happyr\DoctrineSpecification\Repository\EntitySpecificationRepository;
+use Shlinkio\Shlink\Rest\Entity\ApiKey;
+
+class ApiKeyRepository extends EntitySpecificationRepository implements ApiKeyRepositoryInterface
+{
+    public function createInitialApiKey(string $apiKey): void
+    {
+        $this->getEntityManager()->wrapInTransaction(function () use ($apiKey): void {
+            $qb = $this->getEntityManager()->createQueryBuilder();
+            $amountOfApiKeys = $qb->select('COUNT(a.id)')
+                                  ->from(ApiKey::class, 'a')
+                                  ->getQuery()
+                                  ->setLockMode(LockMode::PESSIMISTIC_WRITE)
+                                  ->getSingleScalarResult();
+
+            if ($amountOfApiKeys === 0) {
+                $this->getEntityManager()->persist(ApiKey::fromKey($apiKey));
+                $this->getEntityManager()->flush();
+            }
+        });
+    }
+}