Update Dockerfile

Co-authored-by: Robert Sachunsky <38561704+bertsky@users.noreply.github.com>

Author: mikegerber

Dockerfile

@@ -3,7 +3,11 @@ FROM $DOCKER_BASE_IMAGE
 ARG VCS_REF
 ARG BUILD_DATE
 LABEL \
-    maintainer="https://ocr-d.de/kontakt" \
+LABEL \
+    maintainer="https://github.com/qurator-spk/dinglehopper/issues" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/qurator-spk/dinglehopper" \
+    org.label-schema.build-date=$BUILD_DATE
     org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.vcs-url="https://github.com/qurator-spk/dinglehopper" \
     org.label-schema.build-date=$BUILD_DATE