Parametarize the script

[sacOO7]

We need to make sure to pass following parameters to the script

• webhook_url -> string
• job -> string
• repo -> string
• branch -> string
• tag -> string
• username -> string
• build_url ->url
• success -> true or false

You can look at existing script to see how it works. These variables are normally available in every CI. Think if u can make it more better 👍

Refer to parameters used by slack-circleci script
https://github.com/CircleCI-Public/slack-orb
https://circleci.com/orbs/registry/orb/circleci/slack