Improve CONTRIBUTING guide

Also:

- update the docker-compose to use Alpine image (lighter)
- update the PHP Dockerfile to use Imagick instead of GD (for GIF support when downloading images) and add support for SQLite

.github/CONTRIBUTING.md

@@ -1,11 +1,41 @@
 # How to contribute
 
+## Test it locally
+
+### Using Docker
+
+- Clone the repository
+- Ensure your Docker daemon is running
+- Launch `docker-compose up`
+
+You'll then have:
+- a web server (nginx)
+- a PHP daemon (using FPM)
+- a Redis database (to handle imports)
+- a SQLite database to store articles
+
+You can now access your wallabag instance using that url: `http://127.0.0.1:8000`
+
+If you want to test using an other database than SQLite, uncomment the `postgres` or `mariadb` code from the `docker-compose.yml` file at the root of the repo. Also uncomment related line in the `php` section so the database will be linked to your PHP instance.
+
+### Using your own PHP server
+
+- Ensure you are running PHP > 7.1.
+- Clone the repository
+- Launch `composer install`
+- If you got some errors, fix them (they might be related to some missing PHP extension from your machine)
+- Then `php bin/console wallabag:install`
+- If you got some errors, fix them (they might be related to some missing PHP extension from your machine)
+- Run `php bin/console server:run`
+
+You can now access your wallabag instance using that url: `http://127.0.0.1:8000`
+
 ## You found a bug
 Please [open a new issue](https://github.com/wallabag/wallabag/issues/new).
 
 To fix the bug quickly, we need some infos: please answer to the questions in the issue form.
 
-If you have the skills, look for errors into php, server and application (see `var/logs`) logs.
+If you have the skills, look for errors into PHP, server and application logs (see `var/logs`).
 
 Note : If you have large portions of text, use [Github's Gist service](https://gist.github.com/) or other pastebin-like.
 

docker-compose.yml

@@ -1,9 +1,9 @@
 version: '2'
 services:
     nginx:
-        image: nginx
+        image: nginx:alpine
         ports:
-            - "8080:80"
+            - "8000:80"
         volumes:
             - ./docker/nginx/nginx.conf:/nginx.conf
             - ./docker/logs/nginx:/var/log/nginx
@@ -32,8 +32,8 @@ services:
             # - ./docker/postgres/env
             # - ./docker/mariadb/env
 
-    #postgres:
-    #    image: postgres:9
+    # postgres:
+    #    image: postgres:11-alpine
     #    ports:
     #        - "5432:5432"
     #    volumes:
@@ -41,7 +41,7 @@ services:
     #    env_file:
     #        - ./docker/postgres/env
 
-    #mariadb:
+    # mariadb:
     #    image: mariadb:10
     #    ports:
     #        - "3306:3306"
@@ -50,12 +50,12 @@ services:
     #    env_file:
     #        - ./docker/mariadb/env
 
-    rabbitmq:
-        image: rabbitmq:3-management
-        ports:
-            - "15672:15672"
+    # rabbitmq:
+    #     image: rabbitmq:3-management-alpine
+    #     ports:
+    #         - "15672:15672"
 
     redis:
-        image: redis
+        image: redis:4-alpine
         ports:
             - "6379:6379"

docker/php/Dockerfile

@@ -4,10 +4,25 @@ FROM php:7.2-fpm
 ARG timezone='Europe/Paris'
 
 RUN apt-get update && apt-get install -y \
-        libmcrypt-dev libicu-dev libpq-dev libxml2-dev libpng-dev libjpeg-dev \
-    && /usr/local/bin/docker-php-ext-configure gd --with-jpeg-dir=/usr/include \
-    && docker-php-ext-install \
-        iconv mbstring intl pdo pdo_mysql pdo_pgsql gd
+        libmcrypt-dev \
+        libicu-dev \
+        libpq-dev \
+        libxml2-dev \
+        libpng-dev \
+        libjpeg-dev \
+        libsqlite3-dev \
+        imagemagick \
+        libmagickwand-dev
+RUN docker-php-ext-install \
+        iconv \
+        mbstring \
+        intl \
+        pdo \
+        pdo_mysql \
+        pdo_pgsql \
+        pdo_sqlite
+
+RUN printf "\n" | pecl install imagick && docker-php-ext-enable imagick
 
 RUN echo "date.timezone="$timezone > /usr/local/etc/php/conf.d/date_timezone.ini