Add Docker Compose and Dev Containers

[jarofgreen]

Can now develop without having to set up postgres yourself

[R2ZER0]

If you feel like saving some disk space, it seems these days they recommend clearing apt cache after installing things https://github.com/hadolint/hadolint/wiki/DL3009

[jarofgreen]

I don't want to change the prod Docker image in this PR but I'll note this for later

[R2ZER0]

Suggested change

	RUN apt-get update \
	&& apt-get install -y libpq-dev gcc postgresql-client git
	RUN apt-get update \
	&& apt-get install --no-install-recommends -y libpq-dev gcc postgresql-client git \
	&& apt-get clean \
	&& rm -rf /var/lib/apt/lists/*

[R2ZER0]

Again super nitpicky https://github.com/hadolint/hadolint/wiki/DL3042

Suggested change

	RUN pip install -r requirements.txt
	COPY . .
	RUN pip install -e .
	RUN pip install --no-cache-dir -r requirements.txt
	COPY . .
	RUN pip install --no-cache-dir -e .

[R2ZER0]

Aha so, we don't actually start the app here, but instead the user should shell in and start the app themselves? (I don't really know anything about the ic4ids datastore)

[jarofgreen]

Yeah, sometimes it's an interesting question about whether we want dev containers to do the thing or let the user do the thing but in this case I think clearly the dev probably wants to adjust something, set up run parameters or change code, and then run the app several times as they do their work.

[R2ZER0]

Looks good 👍