Step by Step
gpg --keyserver keys.gnupg.net --recv-key 89DF5277 && gpg -a --export 89DF5277 | apt-key add
Add sources
nano /etc/apt/sources.list
deb http://packages.dotdeb.org jessie all deb-src http://packages.dotdeb.org jessie all
apt-get update
apt-get install php7.0-cli php7.0-fpm php7.0-mysql php7.0-curl php7.0-gd php7.0-imagick php7.0-mcrypt php7.0-memcached php7.0-imap python-software-properties software-properties-common php7.0 php7.0 php7.0-common php7.0-gd php7.0-mysql php7.0-mcrypt php7.0-curl php7.0-intl php7.0-xsl php7.0-mbstring php7.0-zip php7.0-bcmath php7.0-iconv -y
Install Percona Database Server
wget https://repo.percona.com/apt/percona-release_0.1-4.$(lsb_release -sc)_all.deb
dpkg -i percona-release_0.1-4.$(lsb_release -sc)_all.deb
Update the repo
apt-get update apt-get install percona-server-server-5.7 percona-server-client-5.7 -y
wget https://s3.amazonaws.com/ns1-serverbackups/Nginx/nginx_1.10.2-1-jessie_amd64.deb