fix: Update Dockerfile to set JAVA_HOME and ensure JDK is installed

Author: th33k

Dockerfile

@@ -7,9 +7,14 @@ RUN apt-get update && apt-get install -y \
     unzip \
     nodejs \
     npm \
-    openjdk-11-jre && \
+    openjdk-11-jdk && \
     apt-get clean && rm -rf /var/lib/apt/lists/*
 
+# Set JAVA_HOME environment variable
+ENV JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
+RUN java -version && \
+    echo "JAVA_HOME is set to $JAVA_HOME"
+
 # Download and extract Ballerina SDK
 RUN curl -L https://dist.ballerina.io/downloads/2201.12.0/ballerina-2201.12.0-swan-lake.zip -o ballerina.zip && \
     unzip -t ballerina.zip && \
@@ -38,4 +43,4 @@ USER 10001
 
 # Prepare the final image
 WORKDIR /app
-CMD ["sh", "-c", "java -jar /app/Back-End/target/bin/ResourceHub.jar & npx serve -s /app/Front-End/build -l 80"]
+CMD ["sh", "-c", "java -jar /app/Back-End/target/bin/ResourceHub.jar & npx serve -s /app/Front-End/build -l 80"]