feat: replace custom bootjdk with ubuntu package

Dockerfile.openj9

@@ -5,20 +5,15 @@ FROM ubuntu:25.04 AS build
 RUN apt -qq update \
   && apt -qq upgrade -y \
   && apt -qq install -y --no-install-recommends \
-    ant ant-contrib autoconf build-essential ca-certificates cmake cpio curl execstack file gcc g++ git \
-    libasound2-dev libcups2-dev libdwarf-dev libelf-dev libexpat1-dev libffi-dev libfontconfig libfontconfig1-dev \
-    libfreetype6-dev libnuma-dev libssl-dev libx11-dev libxext-dev libxrandr-dev libxrender-dev libxt-dev libxtst-dev \
-    make nasm pkg-config python3 python3-dev rsync systemtap-sdt-dev unzip wget xvfb zip zlib1g-dev unzip \
+    ant ant-contrib autoconf ca-certificates cmake cpio file gcc g++ git \
+    libasound2-dev libcups2-dev libdwarf-dev libelf-dev libexpat1-dev libffi-dev \
+    libfontconfig libfontconfig1-dev libfreetype6-dev libnuma-dev libssl-dev \
+    libx11-dev libxext-dev libxrandr-dev libxrender-dev libxt-dev libxtst-dev \
+    make nasm openjdk-21-jdk-headless pkg-config python3 python3-dev rsync \
+    systemtap-sdt-dev xvfb zlib1g-dev \
   && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /build
-RUN mkdir /build/bootjdk /build/dist \
-  && wget --progress=dot:mega -O jdk21.tar.gz \
-  https://api.adoptopenjdk.net/v3/binary/latest/21/ga/linux/x64/jdk/openj9/normal/adoptopenjdk \
-  && tar -xzf jdk21.tar.gz --directory=/build/bootjdk --strip-components=1 \
-  && rm -f jdk21.tar.gz
-
-RUN find /build/bootjdk -name '*.so' -type f -print0 | xargs -0 -- execstack -c
 
 RUN git clone --single-branch --depth 1 \
   https://github.com/ibmruntimes/openj9-openjdk-jdk21.git \
@@ -32,7 +27,7 @@ ENV CC=/usr/bin/gcc CXX=/usr/bin/g++
   # CFLAGS="-O3 -flto -fwhole-program-vtables" \
   # LDFLAGS="-Wl,-O1"
 RUN bash configure \
-  --with-boot-jdk=/build/bootjdk \
+  --with-boot-jdk=/usr/lib/jvm/java-21-openjdk-amd64 \
   --with-openssl=system
 RUN make all JOBS=$(nproc)