style(ct): add missing BASE_IMAGE arg and clarify workaround labeling

Updated Dockerfile to include the BASE_IMAGE argument. The ARG value is not available anymore _after_ the FROM statement, so we need to repeat it for the workaround to work in full.

Author: poikilotherm

src/main/docker/Dockerfile

@@ -46,8 +46,9 @@ RUN ln -s "${DEPLOY_DIR}/dataverse/supplements/jhove.conf" "${PAYARA_DIR}/glassf
     ln -s "${DEPLOY_DIR}/dataverse/supplements/jhoveConfig.xsd" "${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}/config/jhoveConfig.xsd" && \
     sed -i "${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}/config/jhove.conf" -e "s:/usr/local/payara./glassfish/domains/domain1:${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}:g"
 
-# Workaround for fabric8io/docker-maven-plugin#1865
+# Workaround for fabric8io/docker-maven-plugin#1865 (both arg lines)
 ARG APP_IMAGE_VERSION
+ARG BASE_IMAGE
 LABEL org.opencontainers.image.created="@git.build.time@" \
       org.opencontainers.image.authors="Research Data Management at FZJ <[email protected]>" \
       org.opencontainers.image.url="https://guides.dataverse.org/en/latest/container/" \