switch to ubuntu for runtime

Dockerfile

@@ -9,10 +9,9 @@ RUN ["chmod", "+x", "./mvnw"]
 RUN ./mvnw install
 
 
-FROM docker.io/library/eclipse-temurin:25-jre-alpine
+FROM docker.io/library/eclipse-temurin:25-jre
 
-RUN apk add netcat-openbsd
+RUN apt-get update && apt-get install -y --no-install-recommends netcat-openbsd curl && rm -rf /var/lib/apt/lists/*
-RUN apk add curl
 
 WORKDIR /app