feat(ci): Support for MASTER_PASSWORD to be set on Gitlab Settings > CI/CD > Variables

LICENSE

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+   Copyright (C) 2023 Bundesministerium des Innern und für Heimat,
+                      PG ZenDiS "Projektgruppe für Aufbau ZenDiS"
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.