Fix pom.xml: remove quarkus-rest-multipart (built into quarkus-rest), add maven-resources-plugin version; fix Dockerfile: DOSTALGIA_DATA -> DOSTALGIA_DATA_DIR

Dockerfile

@@ -24,5 +24,5 @@ WORKDIR /app
 COPY --from=build /build/target/quarkus-app/ /app/
 EXPOSE 8765
 VOLUME /data
-ENV DOSTALGIA_DATA=/data
+ENV DOSTALGIA_DATA_DIR=/data
 ENTRYPOINT ["java", "-jar", "quarkus-run.jar"]