add user_data templatefile and add SSH_PUBLIC_KEY to trusted keys

variables.tf

@@ -1,26 +1,5 @@
 # Variables
 
-variable "user_data" {
-  description = "Cloud Init 'user_data'"
-  default = <<-EOF
-              #!/bin/bash
-              sudo apt update -y
-              sudo apt-get -y install ca-certificates curl
-              sudo install -y -m 0755 -d /etc/apt/keyrings
-              sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
-              sudo chmod a+r /etc/apt/keyrings/docker.asc
-
-              # Add the repository to Apt sources:
-              echo \
-                "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
-                $(. /etc/os-release && echo "$VERSION_CODENAME") 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 docker-buildx-plugin docker-compose-plugin
-             EOF
-}
-
 variable "instance_size" {
   description = "Size of instance to create"
   default = "t2.micro"