Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -17,7 +17,7 @@ openapi4j-parser:
   before_script:
     - npm install -g @apidevtools/swagger-cli
     - export DEBIAN_FRONTEND=noninteractive
-    - apt-get update && apt-get install -y openjdk-11-jre && rm -rf /var/lib/apt/lists/*
+    - apt-get update && apt-get install -y openjdk-11-jre
   script:
     - swagger-cli bundle -t yaml -o "spec/zustelldienst-bundled.yml" "spec/zustelldienst.yml"
     - java -jar openapi4j-parser-cli-1.0.0.jar "spec/zustelldienst-bundled.yml"