[DB] Upgrade to postgres 15

Execute the following commands, before pulling:
docker-compose up -d
docker-compose exec postgres pg_dump danbooru2 -U danbooru > backup.sql
docker-compose down
docker volume rm e621ng_db_data

Execute the following commands, after pulling:
docker-compose up -d
docker-compose exec -T postgres psql -d e621_development -U e621 < backup.sql

This also changes the name of the database and role.
Now seems like a nice opportunity to do so.

Dockerfile

@@ -1,6 +1,6 @@
 FROM ruby:3.1.3-alpine3.17 as ruby-builder
 
-RUN apk --no-cache add build-base git glib-dev postgresql12-dev
+RUN apk --no-cache add build-base git glib-dev postgresql15-dev
 
 COPY Gemfile Gemfile.lock ./
 RUN gem i bundler:2.3.12 foreman && BUNDLE_IGNORE_CONFIG=true bundle install -j$(nproc) \
@@ -22,7 +22,7 @@ RUN corepack enable && corepack prepare --activate && yarn install
 FROM ruby:3.1.3-alpine3.17
 
 RUN apk --no-cache add ffmpeg vips \
-  postgresql12-client \
+  postgresql15-client \
   git jemalloc tzdata
 
 WORKDIR /app

README.md

@@ -46,7 +46,7 @@ Try this:
 
 `docker compose run --rm rubocop` to run the linter. You will see a truckload of violations but CI will ignore these.
 
-The postgres server accepts outside connections which you can use to access it with a local client. Use `localhost:34517` to connect to a database named `danbooru2` with the user `danbooru`. Leave the password blank, anything will work.
+The postgres server accepts outside connections which you can use to access it with a local client. Use `localhost:34517` to connect to a database named `e621_development` with the user `e621`. Leave the password blank, anything will work.
 
 ## Production Setup
 

config/database.yml

@@ -1,18 +1,17 @@
 default: &default
   adapter: postgresql
   timeout: 5000
+  username: e621
 
 development:
   <<: *default
-  database: danbooru2
+  database: e621_development
-  username: danbooru
   host: postgres
   pool: 5
 
 test:
   <<: *default
-  database: danbooru2_test
+  database: e621_test
-  username: danbooru
   host: postgres
   pool: 5
 
@@ -20,7 +19,6 @@ test:
 production:
   <<: *default
   database: e621
-  username: e621
   password: <%= ENV.fetch("DB_PASSWORD") %>
   host: <%= ENV.fetch("DB_HOST") %>
   pool: <%= Sidekiq.server? ? ENV.fetch("DB_WORKER_POOL_SIZE") : ENV.fetch("DB_POOL_SIZE") %>

docker-compose.yml

@@ -58,9 +58,10 @@ services:
       - "3000:3000"
     
   postgres:
-    image: postgres:12-alpine
+    image: postgres:15-alpine
     environment:
-      - POSTGRES_USER=danbooru
+      - POSTGRES_USER=e621
+      - POSTGRES_DB=e621_development
       - POSTGRES_HOST_AUTH_METHOD=trust
     volumes:
       - db_data:/var/lib/postgresql/data