Update dockerisation procedures to work on M1 Mac

Dockerfile

@@ -14,7 +14,7 @@ RUN javac -version
 # install ant
 RUN apt update
 RUN apt -y install ant
-RUN ant -version
+# RUN ant -version # Causes issues with docker build
 
 # install antlr
 WORKDIR /usr/local/lib

config/docker-compose.yml

@@ -1,7 +1,7 @@
 version: "3.7"
 services:
   db:
-    image: "mysql:5.7"
+    image: "mariadb:10.4" # Equivalent to mysql:5.7 and works on M1 Macs
     restart: always
     environment:
      MYSQL_ROOT_PASSWORD: root

doc/docker.md

@@ -5,19 +5,27 @@ This guide will list the steps required to setup the application using Docker.
 
 ### Prerequisites
 
-Please ensure that you have downloaded Docker in your local machine. When you open the Docker web application, the application should be displaying a green icon on the bottom left with the hover text, "Running". 
+Please ensure that you have downloaded Docker in your local machine. Docker can be installed from https://www.docker.com/products/docker-desktop/. When you open the Docker web application, the application should be displaying a green icon on the bottom left with the hover text, "Running". 
 
 ### Set-up commands
 1. Clone SSID's source code onto your computer
     <pre>git clone https://github.com/WING-NUS/SSID.git</pre>
-2. Copy config/database.docker.yml to config/database.yml
-3. Open a terminal and under the application root directory, run the below command:
+2. Copy all the contents from config/database.docker.yml to replace all the contents of config/database.yml.
+3. From here on, if any of the commands fail, try adding sudo in front of the commands (for Mac/Linux systems). For Windows systems, try running the commands in an administrator command prompt.
+4. Open a terminal and under the application root directory, run the command below:
     <pre>docker build .</pre>
-4. Next run the below commands:
+5. Next run the below commands:
     <pre>cd config/
    docker-compose run web bundle install
    docker-compose run web rails db:setup
    docker-compose build 
    docker-compose up</pre>
-5. Go to 127.0.0.1:3000 in the browser to see the login interface
-6. Login with username `admin` and password `$$SSIDPassword$$`
+6. Go to 127.0.0.1:3000 in the browser to see the login interface
+7. Login with username `[email protected]` and password `SSIDPassword123!`
+
+### Shutting down the application
+1. To shut down the application, press Ctrl+C in the terminal where the application is running.
+
+### Turning on the application
+1. To turn on the application, run the command below:
+    <pre>docker-compose up</pre>