Include LABEL information on the skycoin/skycoindev-cli:did image, also add a 'apt clean' command to get a more thin layer.

Author: stdevPavelmc

docker/images/dev-docker/Dockerfile

@@ -1,6 +1,11 @@
-# Creates an image for skycoin development
+# Creates an image for skycoin development with docker in docker
 FROM skycoin/skycoindev-cli:develop
 
+# Image labels
+LABEL "org.label-schema.name"="skycoin/skycoindev-cli:dind" \
+      "org.label-schema.vcs-url"="https://github.com/skycoin/skycoin/tree/develop/docker/images/dev-docker" \
+      "org.label-schema.vendor"="www.skycoin.net"
+
 # Install docker
 
 RUN curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
@@ -10,7 +15,8 @@ RUN set -ex; \
     apt-get install -y --no-install-recommends \
     lsb-release \
     software-properties-common \
-    apt-transport-https
+    apt-transport-https ;\
+    apt clean
 
 RUN add-apt-repository \
    "deb [arch=amd64] https://download.docker.com/linux/debian \

docker/images/dev-docker/README.md

@@ -2,7 +2,7 @@
 
 ## Simple Tags
 
--	[`dind` (*docker/images/devdocker/Dockerfile*)](https://github.com/skycoin/skycoin/tree/develop/docker/images/devdocker/Dockerfile)
+-	[`dind` (*docker/images/dev-docker/Dockerfile*)](https://github.com/skycoin/skycoin/tree/develop/docker/images/dev-docker/Dockerfile)
 
 # Skycoin development image including [docker in docker](https://hub.docker.com/_/docker/)