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

ssl/Dockerfile

@@ -1,16 +1,24 @@
 FROM alpine:3.9
-ENV CODE_VERSION=1.0
+
+ARG VCS_REF
+
+ENV CODE_VERSION=1.0.1 \
+    PKI_ROOT=/kopano/easypki \
+    PKI_ORGANIZATION="Internal Kopano System" \
+    PKI_COUNTRY=DE
 
 LABEL maintainer=az@zok.xyz \
-      version="1.0"
+    org.label-schema.name="Kopano SSL container" \
+    org.label-schema.description="Helper Container for carrying out ssl related activities for the Kopano stack." \
+    org.label-schema.url="https://kopano.io" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/zokradonh/kopano-docker" \
+    org.label-schema.version=$CODE_VERSION \
+    org.label-schema.schema-version="1.0"
 
 RUN mkdir -p /kopano/easypki /kopano/ssl /kopano/ssl/clients
 WORKDIR /kopano/easypki
 
-ENV PKI_ROOT /kopano/easypki
-ENV PKI_ORGANIZATION Internal Kopano System
-ENV PKI_COUNTRY DE
-
 RUN apk add --no-cache \
     easypki \
     openssl