Possiblity to autoinstall in Docker Compose (#3353)

* Possiblity to autoinstall in Docker Compose

#fix https://github.com/FreshRSS/FreshRSS/issues/3349

It is simply calling our existing CLI: do-install.php and
create-user.php
https://github.com/FreshRSS/FreshRSS/tree/master/cli

FreshRSS will typically be ready a few seconds before the database, so
introduce a tolerance when the database is not available / up (yet) by
trying a few times to connect. Also useful to avoid service interruption
when DB service is restarted.

Example:

```yml
freshrss-app:
    image: freshrss/freshrss
    container_name:
freshrss-app
    hostname: freshrss-app
    restart: unless-stopped

ports:
      - "8080:80"
    depends_on:
      - freshrss-db

volumes:
      - data:/var/www/FreshRSS/data
      -
extensions:/var/www/FreshRSS/extensions
    environment:
      CRON_MIN:
'*/20'
      FRESHRSS_ENV: development
      FRESHRSS_INSTALL: |-

--api_enabled
        --base_url https://rss.example.net

--db-base freshrss
        --db-host freshrss-db
        --db-password
freshrss
        --db-type pgsql
        --db-user freshrss

--default_user admin
        --language en
      FRESHRSS_USER: |-

--api_password freshrss
        --email user@example.net

--language en
        --password freshrss
        --user admin
      TZ:
Europe/Paris
```

* Minor type f in find

* shellcheck

1 files changed, 5 insertions, 7 deletions

diff --git a/Docker/docker-compose.yml b/Docker/docker-compose.yml
index e478f404e..8fcc6f6d6 100644
--- a/Docker/docker-compose.yml
+++ b/Docker/docker-compose.yml
@@ -9,9 +9,9 @@ services:
     volumes:
       - db:/var/lib/postgresql/data
     environment:
-      - POSTGRES_USER=freshrss
-      - POSTGRES_PASSWORD=freshrss
-      - POSTGRES_DB=freshrss
+      POSTGRES_USER: freshrss
+      POSTGRES_PASSWORD: freshrss
+      POSTGRES_DB: freshrss
 
   freshrss-app:
     image: freshrss/freshrss:latest
@@ -26,10 +26,8 @@ services:
       - data:/var/www/FreshRSS/data
       - extensions:/var/www/FreshRSS/extensions
     environment:
-      - CRON_MIN=*/20
-      - TZ=Europe/Copenhagen
-    labels:
-      - "traefik.port=80"
+      CRON_MIN: '*/20'
+      TZ: Europe/Paris
 
 volumes:
   db: