Add docker arg for base image and change labels

Dockerfile

@@ -1,21 +1,12 @@
-FROM ocrd/core-cuda
+ARG DOCKER_BASE_IMAGE
+FROM $DOCKER_BASE_IMAGE
 ARG VCS_REF
 ARG BUILD_DATE
-MAINTAINER [email protected]
-LABEL maintainer="https://ocr-d.de"
-LABEL org.label-schema.vendor="DFG-Funded Initiative for Optical Character Recognition Development"
-LABEL org.label-schema.name="ocrd_kraken"
-LABEL org.label-schema.vcs-ref=$VCS_REF
-LABEL org.label-schema.vcs-url="https://github.com/OCR-D/ocrd_kraken"
-LABEL org.label-schema.build-date=$BUILD_DATE
-LABEL org.opencontainers.image.vendor="DFG-Funded Initiative for Optical Character Recognition Development"
-LABEL org.opencontainers.image.title="ocrd_kraken"
-LABEL org.opencontainers.image.description="Kraken bindings"
-LABEL org.opencontainers.image.source="https://github.com/OCR-D/ocrd_kraken"
-LABEL org.opencontainers.image.documentation="https://github.com/OCR-D/ocrd_kraken/blob/${VCS_REF}/README.md"
-LABEL org.opencontainers.image.revision=$VCS_REF
-LABEL org.opencontainers.image.created=$BUILD_DATE
-LABEL org.opencontainers.image.base.name=ocrd/core-cuda
+LABEL \
+    maintainer="https://ocr-d.de/kontakt" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/OCR-D/ocrd_kraken" \
+    org.label-schema.build-date=$BUILD_DATE
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV PYTHONIOENCODING utf8

Makefile

@@ -8,6 +8,8 @@ PYTHONIOENCODING=utf8
 
 # Docker container tag ("$(DOCKER_TAG)")
 DOCKER_TAG = 'ocrd/kraken'
+DOCKER_BASE_IMAGE = docker.io/ocrd/core-cuda:v2.70.0
+
 
 # BEGIN-EVAL makefile-parser --make-help Makefile
 
@@ -62,8 +64,9 @@ build:
 # Build docker image
 docker:
 	docker build \
-        --build-arg VCS_REF=$$(git rev-parse --short HEAD) \
-        --build-arg BUILD_DATE=$$(date -u +"%Y-%m-%dT%H:%M:%SZ") \
+	--build-arg DOCKER_BASE_IMAGE=$(DOCKER_BASE_IMAGE) \
+	--build-arg VCS_REF=$$(git rev-parse --short HEAD) \
+	--build-arg BUILD_DATE=$$(date -u +"%Y-%m-%dT%H:%M:%SZ") \
 	-t $(DOCKER_TAG) .
 
 # Run test