Explain how to use the new dynamic config (#50)

* Explain how to use the new dynamic config introduced in #25

* fix typo

README.md

@@ -66,8 +66,10 @@ services:
       - ./uploads:/var/lib/pleroma/uploads
       - ./static:/var/lib/pleroma/static
       - ./config.exs:/etc/pleroma/config.exs:ro
+      # optional, see 'Config Override' section in README.md
+      # - ./config-override.exs:/var/lib/pleroma/config.exs:ro
     environment:
-      DOMAIN: exmaple.com
+      DOMAIN: example.com
       INSTANCE_NAME: Pleroma
       ADMIN_EMAIL: admin@example.com
       NOTIFY_EMAIL: notify@example.com
@@ -93,45 +95,7 @@ docker exec -i pleroma_db psql -U pleroma -c "CREATE EXTENSION IF NOT EXISTS cit
 docker-compose down
 ```
 
-Configure Pleroma. Copy the following to `config/secret.exs`:
-
-```exs
-use Mix.Config
-
-config :pleroma, Pleroma.Web.Endpoint,
-   http: [ ip: {0, 0, 0, 0}, ],
-   url: [host: "pleroma.domain.tld", scheme: "https", port: 443],
-   secret_key_base: "<use 'openssl rand -base64 48' to generate a key>"
-
-config :pleroma, :instance,
-  name: "Pleroma",
-  email: "admin@email.tld",
-  limit: 5000,
-  registrations_open: true
-
-config :pleroma, :media_proxy,
-  enabled: false,
-  redirect_on_failure: true,
-  base_url: "https://cache.domain.tld"
-
-# Configure your database
-config :pleroma, Pleroma.Repo,
-  adapter: Ecto.Adapters.Postgres,
-  username: "pleroma",
-  password: "pleroma",
-  database: "pleroma",
-  hostname: "postgres",
-  pool_size: 10
-```
-
-You need to change at least:
-
-- `host`
-- `secret_key_base`
-- `email`
-
-Make sure your PostgreSQL parameters are ok.
-
+Optionally configure Pleroma, see [Config Override](#config-override).
 You can now build the image. 2 way of doing it:
 
 ```sh
@@ -142,33 +106,13 @@ docker build -t pleroma .
 
 I prefer the latter because it's more verbose but this will ignore any build-time variables you have set in `docker-compose.yml`.
 
-Setup the database:
-
-```sh
-docker-compose run --rm web mix ecto.migrate
-```
-
-Get your web push keys and copy them to `secret.exs`:
-
-```
-docker-compose run --rm web mix web_push.gen.keypair
-```
-
-You will need to build the image again, to pick up your updated `secret.exs` file:
-
-```
-docker-compose build
-# or
-docker build -t pleroma .
-```
-
 You can now launch your instance:
 
 ```sh
 docker-compose up -d
 ```
 
-Check if everything went well with:
+The initial creation of the database schema will be done automatically. Check if everything went well with:
 
 ```sh
 docker logs -f pleroma_web
@@ -209,6 +153,12 @@ docker build -t pleroma . --build-arg PLEROMA_VER=v2.0.7 # a version
 
 This value can also be set through `docker-compose.yml` as seen in the example file provided in this repository.
 
+## Config Override
+By default the provided `docker-compose.yml` file mounts `config.exs` in the Pleroma container, this file is a dynamic configuration that sources some values from the environment variables provided to the container (variables like `ADMIN_EMAIL` etc.).
+
+For those that want to change configuration that is not exposed through environment variables there is the option to mount the `config-override.exs` file which can than be modified to your satisfaction. Values set in this file will override anything set in `config.exs`. The override file provided in this repository disables new registrations on your instance, as an example.
+=======
+
 ## Other Docker images
 
 Here are other Pleroma Docker images that helped me build mine:

config-override.exs

@@ -0,0 +1,4 @@
+import config
+
+config :pleroma, :instance,
+  registrations_open: false