transition to all versions numbers in labels (#175)

* update supercronic to the latest release
* update tagging for base
* fix version tag for core
* put versions for all containers into labels instead
* define vcf_ref once
* remove cache-from as caches will be invalidated early on because of passing the git ref early on
* do not rebuild when publishing
* do not rebuild when publishing
* reduce layers required for env assignment
* pull newer base images for kdav, scheduler and ssl if available
* alsp publish tag for ldap containers
* fix publishing of ssl container

ldap/Dockerfile

@@ -1,8 +1,20 @@
 ARG CODE_VERSION=1.2.4
 FROM osixia/openldap:${CODE_VERSION}
+
+ARG VCS_REF
 ARG CODE_VERSION
+
 ENV CODE_VERSION="${CODE_VERSION}"
 
+LABEL maintainer=az@zok.xyz \
+    org.label-schema.name="Kopano LDAP container" \
+    org.label-schema.description="Container for running OpenLDAP, which already has the Kopano schema included." \
+    org.label-schema.url="https://kopano.io" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/zokradonh/kopano-docker" \
+    org.label-schema.version=$CODE_VERSION \
+    org.label-schema.schema-version="1.0"
+
 COPY bootstrap /container/service/slapd/assets/config/bootstrap
 RUN rm /container/service/slapd/assets/config/bootstrap/schema/mmc/mail.schema
 RUN touch /etc/ldap/slapd.conf