I can't believe it took so long to fix this.

Dockerfile

@@ -1,6 +1,10 @@
 # Use a minimal java image
 FROM openjdk:21-jdk-slim
 
+# Define build-time argument with default value
+ARG APP_PORT=8090
+ENV QUARKUS_HTTP_PORT=$APP_PORT
+
 # Set the working directory inside the container
 WORKDIR /work/
 
@@ -12,10 +16,10 @@ RUN chown 1001 /work \
 COPY --chown=1001:root quarkus-app/ /work/quarkus-app
 
 # Expose the application's port
-EXPOSE 8090
+EXPOSE $APP_PORT
 
 # Switch to non-root user for better security
 USER 1001
 
 # Define the entrypoint to run the JAR
-CMD ["java", "-Dquarkus.http.host=0.0.0.0", "-Dquarkus.http.port=8090", "-jar", "/work/quarkus-app/quarkus-run.jar"]
+CMD ["java", "-Dquarkus.http.host=0.0.0.0", "-Dquarkus.http.port=$QUARKUS_HTTP_PORT", "-jar", "/work/quarkus-app/quarkus-run.jar"]