Merge pull request 'docs: Add Docker install guide' (#348) from docs/docker into main

Reviewed-on: #348

docs/install-docker.md

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+# Create FoundKey instance with Docker Compose
+
+This guide describes how to install and setup FoundKey with Docker Compose.
+
+**WARNING:**
+Never change the domain name (hostname) of an instance once you start using it!
+
+
+## Requirements
+- Docker or Podman
+- Docker Compose plugin (or podman-compose)
+
+If using Podman, replace `docker` with `podman`. Commands using `docker compose` should be replaced with `podman-compose`.
+
+You may need to prefix `docker` commands with `sudo` unless your user is in the `docker` group or you are running Docker in rootless mode.
+
+## Get the repository
+```sh
+git clone https://akkoma.dev/FoundKeyGang/FoundKey.git
+cd FoundKey
+```
+
+To make it easier to perform your own changes on top, we suggest making a branch based on the latest tag.
+In this example, we'll use `v13.0.0-preview1` as the tag to check out and `my-branch` as the branch name.
+```sh
+git checkout tags/v13.0.0-preview1 -b my-branch
+```
+
+## Configure
+
+Copy example configuration files with following:
+
+```sh
+cp .config/docker_example.yml .config/default.yml
+cp .config/docker_example.env .config/docker.env
+```
+
+Edit `default.yml` and `docker.env` according to the instructions in the files.
+You will need to set the database host to `db` and Redis host to `redis` in order to use the internal container network for these services.
+
+
+Edit `docker-compose.yml` if necessary. (e.g. if you want to change the port).
+
+## Build and initialize
+The following command will build FoundKey and initialize the database.
+This will take some time.
+
+``` shell
+docker compose build
+docker compose run --rm web yarn run init
+```
+
+## Launch
+You can start FoundKey with the following command:
+
+```sh
+docker compose up -d
+```
+
+In case you are encountering issues, you can run `docker compose logs -f` to get the log output of the running containers.
+
+## How to update your FoundKey server
+When updating, be sure to check the [release notes](https://akkoma.dev/FoundKeyGang/FoundKey/src/branch/main/CHANGELOG.md) to know in advance the changes and whether or not additional work is required (in most cases, it is not).
+
+To update your branch to the latest tag (in this example `v13.0.0-preview2`), you can do the following:
+```sh
+git fetch -t
+
+# Use --squash if you want to merge all of the changes in the tag into a single commit.
+# Useful if you have made additional changes.
+git merge tags/v13.0.0-preview2
+
+# Rebuild and restart the docker container.
+docker compose build
+docker compose down && docker compose up -d
+```
+
+It may take some time depending on the contents of the update and the size of the database.
+
+## How to execute CLI commands
+```sh
+docker compose run --rm web node packages/backend/built/tools/foo bar
+```