Add BattleCode23 arena implementation

Author: aryansid

codeclash/arenas/__init__.py

@@ -1,4 +1,5 @@
 from codeclash.arenas.arena import CodeArena
+from codeclash.arenas.battlecode23.battlecode23 import BattleCode23Arena
 from codeclash.arenas.battlecode24.battlecode24 import BattleCode24Arena
 from codeclash.arenas.battlecode25.battlecode25 import BattleCode25Arena
 from codeclash.arenas.battlesnake.battlesnake import BattleSnakeArena
@@ -15,6 +16,7 @@
 from codeclash.arenas.robotrumble.robotrumble import RobotRumbleArena
 
 ARENAS = [
+    BattleCode23Arena,
     BattleCode24Arena,
     BattleCode25Arena,
     BattleSnakeArena,

codeclash/arenas/battlecode23/BattleCode23.Dockerfile

@@ -0,0 +1,14 @@
+FROM eclipse-temurin:8-jdk
+
+ENV JAVA_HOME=/opt/java/openjdk
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git curl unzip && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN git clone https://github.com/CodeClash-ai/BattleCode2023.git /workspace \
+    && cd /workspace \
+    && git remote set-url origin https://github.com/CodeClash-ai/BattleCode2023.git
+WORKDIR /workspace
+
+RUN chmod +x gradlew && ./gradlew update
+