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

scheduler/Dockerfile

@@ -1,13 +1,26 @@
-FROM docker:18.09.1
+FROM docker:18.09
+
+ARG VCS_REF
+
+ENV \
+    DOCKERIZE_VERSION=v0.6.1 \
+    SUPERCRONIC_VERSION=0.1.9
+
+LABEL maintainer=az@zok.xyz \
+    org.label-schema.name="Kopano scheduler container" \
+    org.label-schema.description="Helper container for running tasks within the Kopano stack" \
+    org.label-schema.url="https://kopano.io" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/zokradonh/kopano-docker" \
+    org.label-schema.version=$SUPERCRONIC_VERSION \
+    org.label-schema.schema-version="1.0"
 
 RUN apk --no-cache add bash
 
-ENV SUPERCRONIC_VERSION 0.1.8
 RUN wget https://github.com/aptible/supercronic/releases/download/v${SUPERCRONIC_VERSION}/supercronic-linux-amd64 \
     -O /usr/local/bin/supercronic \
     && chmod +x /usr/local/bin/supercronic
 
-ENV DOCKERIZE_VERSION v0.6.1
 RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
     && tar -C /usr/local/bin -xzvf dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
     && rm dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz