Update Dockerfile

Updated java 21 in Docker

docker/build-test/Dockerfile

@@ -1,4 +1,5 @@
-FROM eclipse-temurin:8-jdk-focal 
+#FROM eclipse-temurin:8-jdk-focal 
+FROM eclipse-temurin:21-jdk
 
 RUN mkdir -p /usr/share/man/man1
 RUN apt-get update && apt-get install -y netcat-openbsd zip git less \
@@ -7,7 +8,7 @@ RUN cd /usr/bin && ln -s python3 python
 
 COPY cacerts/README.md cacerts/*.crt /usr/local/share/ca-certificates/
 RUN update-ca-certificates
-RUN java_certs=$JAVA_HOME/jre/lib/security/cacerts; \
+RUN java_certs=$JAVA_HOME/lib/security/cacerts; \
     add_certs=`ls /usr/local/share/ca-certificates/*.crt` && \
     for crt in $add_certs; do \
         name=`basename -s .crt $crt`; \