Add packer and terraform for running a dev server in Hetzner

.gitignore

@@ -22,3 +22,10 @@ gradle-app.setting
 
 # Misc log files
 *.log
+
+# Terraform
+.terraform
+.terraform.lock*
+terraform.tfstate
+terraform.tfstate.backup
+

development/hetzner/hetzner.tf

@@ -0,0 +1,62 @@
+variable "hcloud_token" {
+  sensitive = true
+}
+
+variable "ssh_public_key_path" {
+  type = string
+  default = "~/.ssh/id_ed25519.pub"
+}
+
+variable "server_image_name_label" {
+  type = string
+  default = "elastiknn-development-ubuntu-22.04"
+}
+
+variable "server_location" {
+  type = string
+  default = "fsn1"
+}
+
+variable "server_type" {
+  type = string
+  default = "ccx23"
+}
+
+terraform {
+  required_providers {
+    hcloud = {
+      source = "hetznercloud/hcloud"
+    }
+  }
+  required_version = ">= 0.13"
+}
+
+provider "hcloud" {
+  token = var.hcloud_token
+}
+
+resource "hcloud_ssh_key" "elastiknn_development" {
+  name       = "elastiknn-development"
+  public_key = file(var.ssh_public_key_path)
+}
+
+data "hcloud_image" "elastiknn_development" {
+  with_selector = "name=${var.server_image_name_label}"
+}
+
+# Create a new server running debian
+resource "hcloud_server" "elastiknn_development" {
+  name        = "elastiknn-development"
+  image       = data.hcloud_image.elastiknn_development.id
+  server_type = var.server_type
+  location    = var.server_location
+  ssh_keys    = [hcloud_ssh_key.elastiknn_development.id]
+  public_net {
+    ipv4_enabled = true
+    ipv6_enabled = true
+  }
+}
+
+output "ssh_command" {
+  value = "ssh root@${hcloud_server.elastiknn_development.ipv4_address}"
+}

development/hetzner/image.pkr.hcl

@@ -0,0 +1,31 @@
+packer {
+  required_plugins {
+    hcloud = {
+      version = ">= 1.1.1"
+      source  = "github.com/hetznercloud/hcloud"
+    }
+  }
+}
+
+source "hcloud" "base-amd64" {
+  image         = "ubuntu-22.04"
+  location      = "fsn1"
+  server_type   = "ccx23"
+  ssh_keys      = []
+  user_data     = ""
+  ssh_username  = "root"
+  snapshot_name = "elastiknn-development-ubuntu-22.04"
+  snapshot_labels = {
+    name    = "elastiknn-development-ubuntu-22.04"
+  }
+}
+
+build {
+  sources = ["source.hcloud.base-amd64"]
+  provisioner "shell" {
+    scripts = [ "setup-ubuntu-22.04.sh" ]
+    env = {
+      BUILDER = "packer"
+    }
+  }
+}

development/hetzner/setup-ubuntu-22.04.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+set -e
+
+# Install SBT.
+echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" | sudo tee /etc/apt/sources.list.d/sbt.list
+echo "deb https://repo.scala-sbt.org/scalasbt/debian /" | sudo tee /etc/apt/sources.list.d/sbt_old.list
+curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | sudo apt-key add
+sudo apt-get update
+sudo apt-get install sbt
+
+# Install Docker.
+sudo apt-get update
+sudo apt-get install -y ca-certificates curl
+sudo install -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
+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 -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+# Install task.
+sudo apt-get install -y snapd
+sudo snap install --classic task
+
+# Clone and add asdf to the path.
+git -c advice.detachedHead=false clone --depth 1 https://github.com/asdf-vm/asdf.git $HOME/.asdf --branch v0.14.0
+echo "source $HOME/.asdf/asdf.sh" >> $HOME/.bashrc
+source $HOME/.asdf/asdf.sh
+asdf --version
+
+# Setup asdf plugins.
+asdf plugin add java
+asdf plugin add python
+
+# Install a bunch of system-level libraries which are required for asdf to be able to install python.
+# It's quite annoying that this is required; ideally asdf install python 3.x.y would just work.
+# But I don't know of a way to avoid it, and it seems to come up with all the python version managers.
+sudo apt-get update
+sudo apt-get install -y gcc make zlib1g-dev libssl-dev lzma liblzma-dev libbz2-dev libsqlite3-dev libreadline-dev libffi-dev libncurses5-dev libncursesw5-dev
+
+# Clone Elastiknn.
+git clone https://github.com/alexklibisz/elastiknn.git
+
+# Install the asdf packages specified by elastiknn/.tool-versions
+cd elastiknn && asdf install
+
+# Run the benchmark tests to ensure everything installed correctly.
+task dockerRunBenchmarkingCluster
+task annbTest