feat(*): initialize new Snix infrastructure

Co-Authored-By: edef <edef@edef.eu>
Co-Authored-by: Ryan Lahfa <raito@lix.systems>
Change-Id: Ica1cda177a236814de900f50a8a61d288f58f519

ops/buildkite/snix.tf

@@ -0,0 +1,49 @@
+# Buildkite configuration for snix.
+
+terraform {
+  required_providers {
+    buildkite = {
+      source = "buildkite/buildkite"
+    }
+  }
+
+  backend "s3" {
+    endpoints = {
+      s3 = "https://s3.dualstack.eu-central-1.amazonaws.com"
+    }
+
+    bucket = "snix-tfstate"
+    key    = "terraform/snix-buildkite"
+    region = "eu-central-1"
+
+    skip_credentials_validation = true
+    skip_metadata_api_check = true
+    skip_requesting_account_id  = true
+  }
+}
+
+provider "buildkite" {
+  organization = "snix"
+}
+
+resource "buildkite_cluster" "primary" {
+  name           = "Primary cluster"
+  description    = "Build everything and deploy"
+  emoji          = "🚀"
+  color          = "#bada55"
+
+}
+
+resource "buildkite_pipeline" "snix" {
+  name           = "snix"
+  description    = "Run full CI pipeline of the Snix monorepository."
+  repository     = "https://cl.snix.dev/snix"
+  steps          = file("./steps-snix.yml")
+  default_branch = "refs/heads/canon"
+  cluster_id = buildkite_cluster.primary.id
+}
+
+resource "buildkite_cluster_queue" "default" {
+  cluster_id  = buildkite_cluster.primary.id
+  key         = "default"
+}