Start to document Ansible/Composer requirements

tools/deploying-drutopia-updates.md

@@ -1,7 +1,26 @@
 # Deploying Drutopia updates
 
+## Prerequsites
+
+Note that this is sort of 
+
+```bash
+sudo apt-get install ansible rsync php7.4 php7.4-gd php7.4-mysql php7.4-xml php7.4-curl php7.4-fpm php7.4-sqlite3 php7.4-cli
+```
+
+(Yeah that's more PHP than you need.)
+
+The commands from:
+
+https://getcomposer.org/download/
+
+And then:
+
+```bash
+sudo mv composer.phar /usr/local/bin/composer
+```
+
 ```bash
 cd ~/Projects/drutopia-platform/drutopia_host/hosting_private
 ahoy git-pull-all
-
 ```