updated tasks so they are only run once

tasks/pkgs/clangd.yml

@@ -1,5 +1,17 @@
 # vim: set filetype=yaml.ansible :
 ---
-- name: Append clangd to pkg_sys
-  ansible.builtin.set_fact:
-    pkg_sys: "{{ pkg_sys + clangd.pkgs }}"
+- name: Add clangd
+  when:
+    - clangd_configured is undefined
+  block:
+    - name: Load clangd config
+      ansible.builtin.include_tasks:
+        file: config/clangd.yml
+
+    - name: Append clangd to pkg_sys
+      ansible.builtin.set_fact:
+        pkg_sys: "{{ pkg_sys + clangd.pkgs }}"
+
+    - name: Set clangd_configured
+      ansible.builtin.set_fact:
+        clangd_configured: true