Revamped docker compose

[Anish9901]

Fixes #3306

For the reviewer:

• Not adding any technical details here as the docker compose file should be self explanatory.
• Please go through the docker-compose.yml file, read through the comments and try setting up the prod version of Mathesar.
• Please report any feedback and/or difficulty you faced during the installation.

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• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[mathemancer]

Overall, this is really great. Nice work, @Anish9901 !

I made some changes to get the unified docker image to work. I'd like for you to look at those before we have others work through this.

[mathemancer]

I'm debating whether we should include a default key that's obviously unfit for production. Something like:

Suggested change

	SECRET_KEY: ${SECRET_KEY:?}
	SECRET_KEY: ${SECRET_KEY:-PLEASEDONOTUSETHISSECRETKEYITISSUPERDUPERINSECURE}

[mathemancer]

After some discussion in various channels, I think the current failure state is better in this use-case.

[mathemancer]

@kgodey For testing, you need to run

docker build -t mathesar/mathesar-prod:latest --build-arg PYTHON_REQUIREMENTS=requirements-prod.txt .
docker build -t mathesar/mathesar-caddy:latest -f Dockerfile.caddy .

from the root of the repo. This is because we haven't yet published the new images for 0.1.4. Actual users won't need to do that.

Then, just copy the docker compose file to any directory you want to use for the test installation, and follow the instructions in that file. I recommend using some directory other than the repo to avoid contamination from any dev files (e.g., .env) in the repo, and since this setup adds subdirectories under wherever it's run (as documented in the file).

[Anish9901]

@mathemancer this script fails when all the POSTGRES_* variables are explicitly provided but MATHESAR_DATABASES isn't.

Here is the command I ran:

docker run \
-e POSTGRES_DB=mathesar_django \
-e POSTGRES_HOST=localhost \
-e POSTGRES_PORT=5432 \
-e POSTGRES_USER=mathesar \
-e POSTGRES_PASSWORD='mathesar' \
-v static:/code/static \
-v media:/code/media \
-v postgresql_config:/etc/postgresql/ \
-v postgresql_data:/var/lib/postgresql/ \
--name mathesar_service  \
-p 8000:8000 \
--restart unless-stopped \
mathesar/mathesar-prod:latest

[mathemancer]

Good catch; I've pushed a commit to fix it.

[Anish9901]

Works perfectly after the fix, Brent!

[seancolsen]

I've unassigned @mathemancer and assigned @kgodey per this comment from @mathemancer

[mathemancer]

After chatting in other channels, I'm going to merge this, and we'll handle issues in future PRs.