Self Hosting: Docker Compose setup and flow (#640)

* feat(self-hosting): add docker-compose and ghcr release workflow

* WIP: address review comments

* WIP: fix linting

docs/self-hosting/docker.md

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+# Self Hosting Maybe with Docker
+
+## Quick Start
+
+To quickly get the Maybe app up and running, follow these steps:
+
+* clone the maybe repository to your local machine.
+* navigate to the repository's root directory.
+* copy the `.env.example` file to `.env` and configure the necessary
+environment variables. Edit the `SELF_HOSTING_ENABLED` and `SECRET_KEY_BASE`
+variables. You might want to edit the `DB_HOST`, `DB_PORT`,
+`POSTGRES_PASSWORD`, `POSTGRES_USER` variables as well.
+* run `docker-compose up -d` to start the maybe app in detached mode.
+* access the maybe app by navigating to http://localhost:3000 in your web browser.
+
+## Prerequisites and Setup
+
+Install Docker on your machine by following the appropriate guide for your
+operating system. If you need a GUI, install [Docker
+Desktop](https://docs.docker.com/desktop/), otherwise innstall [Docker
+Engine](https://docs.docker.com/engine/install/) (recommended for production).
+
+Next, follow these steps (shared between docker-compose and standalone):
+
+* clone the maybe repository to your local machine.
+* navigate to the repository's root directory.
+* copy the `.env.example` file to `.env` and configure the necessary
+environment variables. Edit the `SELF_HOSTING_ENABLED` and `SECRET_KEY_BASE`
+variables. You might want to edit the `DB_HOST`, `DB_PORT`,
+`POSTGRES_PASSWORD`, `POSTGRES_USER` variables as well.
+
+### Running the app with docker compose
+
+* run `docker-compose up -d` to start the maybe app in detached mode.
+* access the maybe app by navigating to http://localhost:3000 in your web browser.
+
+### Running the standalone container
+
+* run the `maybe` docker container
+
+```bash
+docker run -d \
+    --name app \
+    -p 3000:3000 \
+    --restart unless-stopped \
+    --env-file .env \
+    -e RAILS_ENV=production \
+    -e RAILS_FORCE_SSL=false \
+    -e RAILS_ASSUME_SSL=false \
+    ghcr.io/maybe-finance/maybe:latest
+```
+
+## Updating the App
+
+To update the Maybe app to the latest version, follow these steps:
+
+* Pull the latest changes from the Maybe repository if running the container in
+standalone mode.
+* If using Docker Compose, update the image field in the docker-compose.yml
+file to point to the new Docker image version (not needed if running on the
+`latest` tag, docker will automatically pull the latest image).
+* Run `docker-compose pull` to pull the latest Docker image.
+* Restart the Maybe app container using `docker-compose up -d`.
+
+## Where should I host?
+
+### Commercial VPS
+### One-Click VPS
+### Standalone Image
+
+## Troubleshooting 
+
+This section will provide troubleshooting tips and solutions for common issues
+encountered during deployment. Check back later for updates!
+