WIP: install requirements via install script

Closes https://git.autonomic.zone/coop-cloud/abra/issues/196.

deploy/install.abra.coopcloud.tech/installer

@@ -5,6 +5,58 @@ GIT_URL="https://git.autonomic.zone/coop-cloud/abra"
 ABRA_SRC="$GIT_URL/raw/tag/$ABRA_VERSION/abra"
 ABRA_DIR="${ABRA_DIR:-$HOME/.abra}"
 
+function prompt_confirm {
+  read -rp "Continue? [y/N]? " choice
+  case "$choice" in
+    y|Y ) return ;;
+    * ) exit;;
+  esac
+}
+
+function show_banner {
+  echo ""
+  echo "   ____                           ____ _                 _ "
+  echo "  / ___|___         ___  _ __    / ___| | ___  _   _  __| |"
+  echo " | |   / _ \ _____ / _ \| '_ \  | |   | |/ _ \| | | |/ _' |"
+  echo " | |__| (_) |_____| (_) | |_) | | |___| | (_) | |_| | (_| |"
+  echo "  \____\___/       \___/| .__/   \____|_|\___/ \__,_|\__,_|"
+  echo "                        |_|"
+  echo ""
+}
+
+function install_docker {
+  sudo apt-get remove docker docker-engine docker.io containerd runc
+  sudo apt-get install \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    gnupg \
+    lsb-release
+  curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
+  echo \
+  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
+  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+  sudo apt-get update
+  sudo apt-get install docker-ce docker-ce-cli containerd.io
+}
+
+function install_requirements {
+  if [ -f "/etc/debian_version" ]; then
+    echo "Installing curl..."
+    sudo apt install -y curl
+
+    echo "Install Docker (hard requirement)?"
+    echo "Follows the commands listed in https://docs.docker.com/engine/install/debian/"
+    prompt_confirm
+    echo "Installing Docker..."
+    install_docker
+  else
+    echo "Sorry, we only support Debian at the moment"
+    echo "You'll have to install the requirements manually for your distribution"
+    echo "See https://git.autonomic.zone/coop-cloud/abra#requirements for more"
+  fi
+}
+
 function install_abra_release {
   mkdir -p "$HOME/.local/bin"
   curl "$ABRA_SRC" > "$HOME/.local/bin/abra"
@@ -24,11 +76,15 @@ function install_abra_dev {
 }
 
 function run_installation {
+  show_banner
+
   if [ "$1" = "--dev" ]; then
     install_abra_dev
   else
     install_abra_release
   fi
+
+  install_requirements
 }
 
 run_installation "$@"