feat: add ibm openj9 java 21

.github/workflows/java-openj9.yml

@@ -31,6 +31,7 @@ jobs:
           - 17
           - 18
           - 20
+          - 21
     steps:
       - name: Git checkout for Github repository workspace
         uses: actions/checkout@v4

README.md

@@ -126,6 +126,8 @@ Navigate to `Admin Panel -> Nests -> Select your egg`. Add Docker image URL(s) f
   - `ghcr.io/software-noob/pterodactyl-images:java_18_openj9`
 - [Java 20 OpenJ9](https://github.com/Software-Noob/pterodactyl-images/tree/main/java-openj9/20)
   - `ghcr.io/software-noob/pterodactyl-images:java_20_openj9`
+- [Java 21 OpenJ9](https://github.com/Software-Noob/pterodactyl-images/tree/main/java-openj9/21)
+  - `ghcr.io/software-noob/pterodactyl-images:java_21_openj9`
 
 ### Java Shenandoah Nightly [AMD64/ARM64]
 

java-openj9/21/Dockerfile

@@ -0,0 +1,23 @@
+FROM        ibm-semeru-runtimes:open-21-jdk
+
+LABEL       author="Softwarenoob" maintainer="[email protected]"
+LABEL       org.opencontainers.image.source="https://github.com/Software-Noob/pterodactyl-images"
+LABEL       org.opencontainers.image.licenses="MIT"
+
+RUN         apt-get update -y \
+            && apt-get install -y --no-install-recommends curl ca-certificates openssl git tar sqlite3 fontconfig libfreetype6 libstdc++6 lsof build-essential tzdata iproute2 locales \
+            && apt-get clean \
+            && rm -rf /var/lib/apt/lists/* \
+            && useradd -m -d /home/container container \
+            && locale-gen en_US.UTF-8
+
+ENV         LC_ALL=en_US.UTF-8
+ENV         LANG=en_US.UTF-8
+ENV         LANGUAGE=en_US.UTF-8
+
+USER        container
+ENV         USER=container HOME=/home/container
+WORKDIR     /home/container
+
+COPY        ./entrypoint.sh /entrypoint.sh
+CMD         [ "/bin/bash", "/entrypoint.sh" ]