Add a desktop file for plainmacs on Linux.

ansible/roles/emacs/tasks/linux.yaml

@@ -30,3 +30,26 @@
       - gopls
       - typescript-language-server
     state: present
+
+- name: Create directories
+  file:
+    name: "{{ item }}"
+    state: directory
+    mode: 0755
+    owner: root
+    group: root # Using root group to match /usr/share/applications
+  loop:
+    - /usr/local/share/applications
+
+- name: Install Configuration
+  copy:
+    src: "files/{{ item.src }}"
+    dest: "{{ item.dest }}"
+    mode: 0644
+    owner: root
+    group: wheel
+    # Can't use validate because it complains about the file extension for the temporary file.
+    # validate: "desktop-file-validate %s"
+  loop:
+    - src: plainmacs.desktop
+      dest: /usr/local/share/applications/