multi-arch-builders/tofu: introduce new toplevel project var

Now we can use `var.project` throughout rather than copy pasting
the name around. Also shorten `coreos-multiarch-builder-aarch64`
here to just `coreos-aarch64-builder`

Author: dustymabe

multi-arch-builders/provisioning/aarch64/README.md

@@ -44,5 +44,5 @@ Make sure your AMI user has access to this policies:
    # If you plan to make changes to the code as modules/plugins, go ahead and run it:
    tofu init -upgrade
    # To destroy it run:
-   tofu destroy -target aws_instance.coreos-multiarch-builder-aarch64 
+   tofu destroy -target aws_instance.coreos-aarch64-builder
 ```

multi-arch-builders/provisioning/aarch64/main.tf

@@ -19,6 +19,12 @@ provider "aws" {}
 provider "ct" {}
 provider "http" {}
 
+variable "project" {
+ type    = string
+ default = "coreos-aarch64-builder"
+}
+
+
 # Get ignition created for the multiarch builder
 resource "null_resource" "butane" {
   provisioner "local-exec" {
@@ -41,9 +47,9 @@ locals {
   ami = lookup(jsondecode(data.http.stream_metadata.body).architectures.aarch64.images.aws.regions, data.aws_region.aws_region.name).image
 }
 
-resource "aws_instance" "coreos-multiarch-builder-aarch64" {
+resource "aws_instance" "coreos-aarch64-builder" {
   tags = {
-    Name = "coreos-aarch64-builder-${formatdate("YYYYMMDD", timestamp())}"
+    Name = "${var.project}-${formatdate("YYYYMMDD", timestamp())}"
   }
   ami           = local.ami 
   user_data     = file("coreos-aarch64-builder.ign")
@@ -57,5 +63,5 @@ resource "aws_instance" "coreos-multiarch-builder-aarch64" {
 }
 
 output "instance_ip_addr" {
-  value = aws_instance.coreos-multiarch-builder-aarch64.private_ip
+  value = aws_instance.coreos-aarch64-builder.private_ip
 } 

multi-arch-builders/provisioning/aarch64/security-groups.tf

@@ -1,5 +1,5 @@
 resource "aws_security_group" "sg" {
-  name        = "coreos-multiarch-aarch64-security-group"
+  name        = "${var.project}-security-group"
   description = "Allow SSH inbound traffic only"
   vpc_id      = var.aws_vpc_prod
 
@@ -10,15 +10,15 @@ resource "aws_security_group" "sg" {
     protocol    = "tcp"
     cidr_blocks = ["0.0.0.0/0"]
   }
- 
+
   egress {
     from_port   = 0
     to_port     = 0
     protocol    = "-1"
     cidr_blocks = ["0.0.0.0/0"]
   }
- 
+
   tags = {
-    Name = "coreos-multiarch-aarch64-security-group"
+    Name = "${var.project}-security-group"
   }
 }