fix(server): Read database config directly from environment variables

Dockerfile

@@ -0,0 +1,15 @@
+# ----------- Stage 1: Build Stage -----------
+FROM gradle:8.13-jdk21 AS build
+WORKDIR /home/gradle/src
+COPY build.gradle.kts settings.gradle.kts gradle.properties ./
+COPY gradle ./gradle
+COPY shared ./shared
+COPY server ./server
+RUN gradle :server:shadowJar --no-configure-on-demand
+
+# ----------- Stage 2: Runtime Stage -----------
+FROM openjdk:21-slim-bookworm AS runtime
+WORKDIR /app
+COPY --from=build /home/gradle/src/server/build/libs/*.jar ./app.jar
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]