add guards to db commands

[jmarsh24]

Both @Adeynack and I ran into an issue when trying to run rails db:pull without having the heroku remote added that we ran into the following error which isn't very descriptive to the issue that the app isn't linked properly. I have added a guard statement for both pull_data and pull_assets db tasks that provide instructions to install aws-cli and link the repo to heroku if it's missing.

❯ rails db:pull
Dropped database 'copacoupona_development'
Dropped database 'copacoupona_test'
heroku pg:pull DATABASE_URL copacoupona_development
 ›   Error: Missing required flag:
 ›    -a, --app APP  app to run command against
 ›   See more help with --help
bin/rails aborted!
Command failed with status (2): [heroku pg:pull DATABASE_URL copacoupona_deve...]

Tasks: TOP => db:pull => db:pull_data
(See full trace by running task with --trace)

[JensRavens]

the two additions are inconsistent. one exists, the other doesnt

[jmarsh24]

I added a matching heroku-cli check to the pull_data task.

pull_data will not check for the heroku-cli, and give brew instructions to install the required package as well as check to make sure there is a linked remote repo, if not, it will remind the user to link the heroku remote.

pull_assets will do something similiar except check if aws is installed and if not it will recommend a brew install or just tell the user to install it on their system.

Does this address your concerns?