[BUGFIX] Use fallback method to get dbname

The fallback chain for determination of the
dbname in the SetupCommand is now using the
dedicated fallback method to gather values
from env -> cli option.

Resolves: #99374
Releases: main
Change-Id: Ic79552b44113659d41cd501bb8d5af7d67cfced6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77162
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Torben Hansen <derhansen@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Torben Hansen <derhansen@gmail.com>
Tested-by: core-ci <typo3@b13.com>

typo3/sysext/install/Classes/Command/SetupCommand.php

@@ -299,14 +299,14 @@ protected function selectAndImportDatabase(mixed $databaseConnection): int
                 return $dbname;
             };
 
-            $dbname = $this->input->getOption('dbname') ?? getenv('TYPO3_SETUP_DBNAME');
-            if (!empty($dbname)) {
-                $dbNameValidator($dbname);
-                $databaseConnection['database'] = $dbname;
-            } else {
+            $dbnameFromCli = $this->getFallbackValueEnvOrOption('dbname', 'TYPO3_SETUP_DBNAME');
+            if ($dbnameFromCli === false && $this->input->isInteractive()) {
                 $dbname = new ChoiceQuestion('Select which database to use: ', $dbChoices);
                 $dbname->setValidator($dbNameValidator);
                 $databaseConnection['database'] = $this->questionHelper->ask($this->input, $this->output, $dbname);
+            } else {
+                $dbNameValidator($dbnameFromCli);
+                $databaseConnection['database'] = $dbnameFromCli;
             }
 
             $checkDatabase = $this->setupDatabaseService->checkExistingDatabase($databaseConnection['database']);