Add local_generic rootfs-images repository

Declares a local generic (raw-file) repo for bootapi's node rootfs tarballs and
wires the local_generic kind through the module. Depends on
terraform-provider-artifactapi #12 releasing v0.1.4 (adds artifactapi_local_generic);
the provider version pin is bumped to 0.1.4, so plan/validate stay red until that
release is available.

- config/local_generic/rootfs-images.yaml (new repo).
- local_generic wiring: config.hcl, module variables.tf + main.tf, env
  terragrunt.hcl inputs; provider pin 0.1.3 -> 0.1.4.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

config/config.hcl

@@ -62,6 +62,11 @@ locals {
       trimsuffix(basename(file_path), ".yaml") => content
       if startswith(file_path, "local_docker/")
     }
+    local_generic = {
+      for file_path, content in local.all_configs :
+      trimsuffix(basename(file_path), ".yaml") => content
+      if startswith(file_path, "local_generic/")
+    }
     virtual = {
       for file_path, content in local.all_configs :
       trimsuffix(basename(file_path), ".yaml") => content

config/local_generic/rootfs-images.yaml

@@ -0,0 +1,2 @@
+---
+description: "Prebuilt node rootfs tarballs for bootapi image-based provisioning (almalinux9-node-*.tar.zst)"