Create the admin user as a separate command (#233)

This means the migrations can always be run on startup, meaning the database won't get out of sync with the running application. It also means users who don't set the credential variables in their compose files don't keep creating admin users every time the application starts.

HOSTING.md

@@ -78,6 +78,7 @@ After the release, these are available under  `_build/prod/rel/plausible` --
 
 ```bash
 _build/prod/rel/plausible/createdb.sh
+_build/prod/rel/plausible/init-admin.sh
 _build/prod/rel/plausible/migrate.sh
 _build/prod/rel/plausible/rollback.sh
 _build/prod/rel/plausible/seed.sh
@@ -87,6 +88,7 @@ the same is available in the docker images as follows --
 
 ```bash
 docker run plausible:master-12add db createdb
+docker run plausible:master-12add db init-admin
 docker run plausible:master-12add db migrate
 docker run plausible:master-12add db rollback
 docker run plausible:master-12add db seed
@@ -120,7 +122,7 @@ Following are the variables that can be used to configure the availability of th
   - Disables changing of subscription and removes the trial notice banner (use with caution!) _defaults to `false`_
 
 ### Default User Generation
-For self-hosting, a default user is generated during the [Database Migration](#Database Migration) to access Plausible. To be noted that, a default user is a user whose trial period expires in 100 Years ;).
+For self-hosting, a default user can be generated using the `db init-admin` command. To be noted that, a default user is a user whose trial period expires in 100 Years ;).
 It is *highly* recommended that you configure these parameters.
 
 - ADMIN_USER_NAME

docker-compose.yml

@@ -38,7 +38,7 @@ services:
     build:
       context: .
       dockerfile: ./Dockerfile
-    command: sh -c "sleep 10 && /entrypoint.sh run"
+    command: sh -c "sleep 10 && /entrypoint.sh db migrate && /entrypoint.sh run"
     depends_on:
       - plausible_db
       - plausible_events_db
@@ -57,7 +57,7 @@ services:
     build:
       context: .
       dockerfile: ./Dockerfile
-    command: sh -c "sleep 10 && /entrypoint.sh db createdb && /entrypoint.sh db migrate"
+    command: sh -c "sleep 10 && /entrypoint.sh db createdb && /entrypoint.sh db migrate && /entrypoint.sh db init-admin"
     depends_on:
       - plausible_db
       - plausible_events_db

lib/plausible_release.ex

@@ -36,7 +36,6 @@ defmodule Plausible.Release do
   def migrate do
     prepare()
     Enum.each(repos(), &run_migrations_for/1)
-    init_admin()
     prepare_clickhouse()
     run_migrations_for_ch()
     IO.puts("Migrations successful!")

rel/overlays/init-admin.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+# Create an admin user
+
+BIN_DIR=`dirname "$0"`
+
+${BIN_DIR}/bin/plausible eval Plausible.Release.init_admin