Add make targets for common tasks on dev env and support for env snapshots

[rochacbruno]

This PR is addresses AAH-387 adding more targets to Makefile

❯ make         
Usage: make <target>

Targets:
help:             ## Show the help.
requirements:     ## Update python dependencies lock files (i.e. requirements.txt).
changelog:        ## Build the changelog
docker/build:     ## Build all development images.
docker/test:      ## Run unit tests.
docker/loaddata:  ## Load initial data from fixtures
docker/migrate:   ## Run django migrations
docker/resetdb:   ## Cleans database
api/get:          ## Make an api get request using 'httpie'
api/shell:        ## Opens django management shell in api container
api/bash:         ## Opens bash session in the api container
api/runserver:    ## Runs api using django webserver for debugging

Also some tweaks to Docker files and setup.py to enable running specific

deps branches.

• if LOCK_REQUIREMENTS is disabled, all deps listed on DEV_SOURCE_PATH is unppined on setup.py

Adds ability to set a global suffix so it is possible to have multiple

environments already built and saved (snapshots)

Build and run environment to work on specific issue

./compose build
./compose up

OMG in the middle of my task I have to work on another issue/hotfix, do I need to rebuild my environment? lost my current state? .. No.

Build and run environment to work on specific issue

./compose stop
export DEV_IMAGE_SUFFIX=fixing_an_urgent_issue 
./compose build
./compose up

Now you can switch the state of DEV_IMAGE_SUFFIX to use whichever environment state you want, (a.k.a snapshot)

Issue: AAH-387

[app-sre-bot]

Can one of the admins verify this patch?

[newswangerd]

make changelog would be really nice. This is how the changelog is built: https://github.com/ansible/galaxy_ng/wiki/Updating-the-Change-Log

I think it just has to run the towncrier command.

[cutwater]

lgtm, nice job

[alikins]

Looks good to me.

Assuming it works for an existing checking without any manual intervention. If it does need some manual intervention, need some docs about it (I may have missed them).

Already covered

[ZitaNemeckova]

@rochacbruno I got this when running anything ./compose

ERROR: The $COMPOSE_PROFILE environment variable MUST be set.
       The the easiest way to to this is to create a .compose.env file by running:

           $ cp .compose.env.example .compose.env

I tried $ cp .compose.env.example .compose.env but it didn't help. So I guess it needs more fool-proof instructions for people like me :D