packer-rocm/amdgpu_install: assume LANG=C for script+stdout/stderr

packer-rocm/playbooks/amdgpu_install.yml

@@ -1,7 +1,9 @@
 ---
 - name: Manage 'amdgpu-install'
   hosts: default
-  environment:  # may be superfluous for your environment; mapped through Packer HCL with 'ansible_env_vars'
+  environment:
+    LANG: C  # some tasks process std{out,err}, aim for consistency
+    # may be superfluous for your environment; mapped through Packer HCL with 'ansible_env_vars'
     http_proxy: "{{ lookup('ansible.builtin.env', 'http_proxy') | default(omit) }}"
     https_proxy: "{{ lookup('ansible.builtin.env', 'https_proxy') | default(omit) }}"
     no_proxy: "{{ lookup('ansible.builtin.env', 'no_proxy') | default(omit) }}"