fix: Update Ballerina SDK extraction path and add version check

Author: th33k

Dockerfile

@@ -13,8 +13,10 @@ RUN apt-get update && apt-get install -y \
 # 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 && \
-    unzip ballerina.zip -d /opt/ballerina && \
-    rm ballerina.zip
+    unzip ballerina.zip -d /opt && \
+    rm ballerina.zip && \
+    chmod +x /opt/ballerina-2201.12.0-swan-lake/bin/bal && \
+    /opt/ballerina-2201.12.0-swan-lake/bin/bal version
 ENV PATH="/opt/ballerina-2201.12.0-swan-lake/bin:${PATH}"
 
 # Build the backend
@@ -36,4 +38,4 @@ 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"]