Quick & dirty local instance installation. I use this for the slave servers only who's only inbound access is restricted to the master. If you're using this locally, that's fine then. Otherwise for production, use it as a reference and secure the permissions on your own accord.

jikan_installation_script.sh

#!/usr/bin/env bash

BUILD_DEPS="zip unzip git"
DEPS="php7.3 curl redis supervisor apache2 php7.3-{xml,mbstring,common,curl,opcache} composer"
JIKAN_PATH="/var/www/jikan"

apt-get update \
  && apt-get -y dist-upgrade \
  && apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 4F4EA0AAE5267A6C \
  && echo "deb http://ppa.launchpad.net/ondrej/php/ubuntu $(lsb_release -s -c) main" | tee /etc/apt/sources.list.d/php.list \
  && apt install software-properties-common \
  && add-apt-repository ppa:ondrej/php \
  && apt-get update \
  && apt-get -y install --no-install-recommends $BUILD_DEPS $DEPS \
  && service redis start

php -v
chmod -R 755 /var/www
mkdir /var/www/jikan
chmod -R 777 /var/www/jikan
git clone https://github.com/jikan-me/jikan-rest.git /var/www/jikan
chmod -R 777 /var/www/jikan
cp "$JIKAN_PATH/.env.dist" "$JIKAN_PATH/.env"

EXPECTED_SIGNATURE="$(wget -q -O - https://composer.github.io/installer.sig)"
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
ACTUAL_SIGNATURE="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"

if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
then
    >&2 echo 'ERROR: Invalid installer signature'
    rm composer-setup.php
    exit 1
fi
php composer-setup.php --quiet
RESULT=$?
rm composer-setup.php
chmod -R 777 /var/www/jikan
php composer.phar install -d /var/www/jikan
php /var/www/jikan/artisan key:generate
php /var/www/jikan/artisan cache:method queue
php /var/www/jikan/artisan cache:driver redis

a2enmod deflate
a2enmod rewrite
sed -i '/<Directory \/var\/www\/>/,/<\/Directory>/ s/AllowOverride None/AllowOverride all/' /etc/apache2/apache2.conf
bash -c 'echo -e "<VirtualHost *:80>\n#ServerName www.example.com\nServerAdmin irfan@dahir.co\nDocumentRoot /var/www/jikan/public\nErrorLog \${APACHE_LOG_DIR}/error.log\nCustomLog \${APACHE_LOG_DIR}/access.log combined\n</VirtualHost>" > "/etc/apache2/sites-available/000-default.conf"'
apt-get clean
service apache2 restart
bash -c 'echo -e "[program:jikan-worker]\nprocess_name=%(program_name)s_%(process_num)02d\ncommand=php '$JIKAN_PATH'/artisan queue:work --queue=high,low\nautostart=true\nautorestart=true\nnumprocs=1\nstdout_logfile='$JIKAN_PATH'/storage/logs/worker.log\nstderr_logfile='$JIKAN_PATH'/storage/logs/worker.error.log" > /etc/supervisor/conf.d/jikan-worker.conf'
service supervisor start
supervisorctl reread
supervisorctl reload
supervisorctl update
supervisorctl start jikan-worker:*
redis-cli config set stop-writes-on-bgsave-error no
chown -R $USER:$USER /var/www/jikan
chmod -R 777 /var/www/jikan