Change base image to eclipse-temurin:11-jdk-alpine

Updated base image from almalinux to eclipse-temurin for both build and runtime stages.

Author: yutaro-sakamoto

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM almalinux:9 AS builder
+FROM eclipse-temurin:11-jdk-alpine AS builder
 
 ARG opensource_COBOL_4J_version=dummy_value Open_COBOL_ESQL_4J_version=dummy_value
 
@@ -43,18 +43,12 @@ RUN cd /root/ && \
     rm -rf /root/Open-COBOL-ESQL-4j-${Open_COBOL_ESQL_4J_version}.tar.gz /root/Open-COBOL-ESQL-4j-${Open_COBOL_ESQL_4J_version}
 
 # Runtime stage
-FROM almalinux:9
+FROM eclipse-temurin:11-jdk-alpine
 
 ARG opensource_COBOL_4J_version=dummy_value Open_COBOL_ESQL_4J_version=dummy_value
 
 SHELL ["/bin/bash", "-c"]
 
-# install runtime dependencies only
-RUN dnf update -y && \
-    dnf install -y java-11-openjdk-devel && \
-    dnf clean all && \
-    rm -rf /var/cache/dnf/*
-
 # create required directories
 RUN mkdir -p /usr/lib/opensourcecobol4j \
              /usr/lib/Open-COBOL-ESQL-4j \