Openebs: Fix the date entry in docker image

[vharsh]

BUG REPORT

What happened:

• No date entry for build-date in maya docker image.

What you expected to happen:

• valid date entry for build-date.

How to reproduce it (as minimally and precisely as possible):

$ docker inspect openebs/maya:ci
...
            "Labels": {
                "org.label-schema.build-date": "",
                "org.label-schema.description": "CLI for OpenEBS",
                "org.label-schema.name": "maya",
                "org.label-schema.schema-version": "1.0",
                "org.label-schema.url": "http://www.openebs.io/",
                "org.label-schema.vcs-url": "https://github.com/openebs/maya",
                "org.label-schema.version": ""
            }

Anything else we need to know?:

• Why is this required?
  It'll be a good helpful metadata in future.

Prerequisites:

• familiarity with docker and shell scripts

How to begin looking for possible solutions?

• look for some scripts which are doing it. Where? maya repo
• _check if some documentations outline this process_
• Try building the maya docker image locally using the Dockerfile

After solving it

• skim through some helpful stuff about continuous integration to get a bigger picture o what just happened

[waseem18]

Hi @vharsh

I would like to look into this :)

[kmova]

/assign @waseem18

[vharsh]

Hi @waseem18
Take a look as to how the docker image is getting build.
Happy Hacking! Happy Learning!

[pik4ez]

Feel free to merge my PR.