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

web/Dockerfile

@@ -1,8 +1,20 @@
 ARG CODE_VERSION=0.6.1
 FROM kopano/kwebd:${CODE_VERSION}
+
+ARG VCS_REF
 ARG CODE_VERSION
+
 ENV CODE_VERSION="${CODE_VERSION}"
 
+LABEL maintainer=az@zok.xyz \
+    org.label-schema.name="Kopano Web container" \
+    org.label-schema.description="Reverse proxy for http(s) based components of kopano-docker" \
+    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"
+
 ENV KWEBD_USER root
 ENV KWEBD_GROUP root
 # hadolint ignore=DL3002