feat: add build job

- add build job that runs `make plan`
- enable provider caching
- enable creating client.crt/client.key

config/nodes/ausyd1nxvm2062_images/terragrunt.hcl

@@ -36,6 +36,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"

config/nodes/prodnxsr0009/terragrunt.hcl

@@ -28,6 +28,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"

config/nodes/prodnxsr0010/terragrunt.hcl

@@ -28,6 +28,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"

config/nodes/prodnxsr0011/terragrunt.hcl

@@ -28,6 +28,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"

config/nodes/prodnxsr0012/terragrunt.hcl

@@ -28,6 +28,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"

config/nodes/prodnxsr0013/terragrunt.hcl

@@ -28,6 +28,7 @@ generate "provider" {
     provider "incus" {
       generate_client_certificates = true
       accept_remote_certificate    = true
+      config_dir = "${get_env("INCUS_CONFIG_DIR")}"
 
       remote {
         name    = "${basename(get_terragrunt_dir())}"