Fix: Dockerfile

[jatinkatyal13]

Currently while building the docker image, every time we make a change to the source code it reinstalls all the node dependencies again.

You might find this article helpful while working on it.

[HeroicHitesh]

@jatinkatyal13 interested in this issue please assign this to me

[jatinkatyal13]

@HeroicHitesh Sure! Go ahead

[HeroicHitesh]

@jatinkatyal13 according to this we need to make a .dockerignore file to exclude node_modules I guess that should resolve this issue. Should I make this file and send a PR?

[HeroicHitesh]

@jatinkatyal13 have a look at PR #21 It might resolve this issue. And we can add .dockerignore as part of good practices of maintaining a Docker project.