Upgrade strategy

[kristjanjansen]

• Upgrade servers to PHP7.3

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update

and then packages based on Settler https://github.com/laravel/settler/blob/master/scripts/provision.sh#L53

apt-get install -y --allow-change-held-packages \
php7.3 php7.3-bcmath php7.3-bz2 php7.3-cgi php7.3-cli php7.3-common php7.3-curl php7.3-dba php7.3-dev php7.3-enchant \
php7.3-fpm php7.3-gd php7.3-gmp php7.3-imap php7.3-interbase php7.3-intl php7.3-json php7.3-ldap php7.3-mbstring \
php7.3-mysql php7.3-odbc php7.3-opcache php7.3-pgsql php7.3-phpdbg php7.3-pspell php7.3-readline php7.3-recode \
php7.3-snmp php7.3-soap php7.3-sqlite3 php7.3-sybase php7.3-tidy php7.3-xml php7.3-xmlrpc php7.3-xsl php7.3-zip

and

sudo systemctl restart nginx

• Upgrade Laravel to 5.7 Laravel 5.7 [upgrade servers first tp PHP5.3] #1945

• Upgrade Laravel to 5.8

• Upgrade Laravel to 6.0

• Upgrade Laravel to support PHP7.4 PHP 7.4 support (needs Laravel 6.x) [do not commit] #1947. While Laravel can work with PHP 7.4 before 6.0, some dependecies can not so we have to go all the way 6.0

• Upgrade servers to PHP7.4