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

playground/Dockerfile

@@ -1,4 +1,5 @@
-from alpine:3.8 as builder
+from alpine:3.9 as builder
+
 RUN apk add --no-cache \
         git make
 RUN mkdir -p /web/oidc-playground /web/kapi-playground
@@ -10,5 +11,18 @@ WORKDIR /web/kapi-playground
 RUN rm Makefile && ln -s oidc-client-example.html index.html
 
 from halverneus/static-file-server:v1.5.2
+
+ARG VCS_REF
+ARG CODE_VERSION
+
 env PORT 8888
+
+LABEL maintainer=az@zok.xyz \
+    org.label-schema.name="Kopano Playground" \
+    org.label-schema.description="Container for running Kopano playground applications for Kapi and OIDC" \
+    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.schema-version="1.0"
+
 COPY --from=builder /web /web