Fix: create ~/.emacs.d and disable global org-id tracking in CI

org-id-find tried to write .org-id-locations to ~/.emacs.d/ which
doesn't exist on the GitHub Actions runner. Create it explicitly and
set org-id-track-globally nil to avoid the file write entirely.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DavidLiedle

.github/workflows/deploy.yml

@@ -31,7 +31,7 @@ jobs:
 
       - name: Build HTML book
         run: |
-          mkdir -p public
+          mkdir -p public ~/.emacs.d
           emacs --batch -l publish.el --funcall org-publish-all
 
       - name: Setup GitHub Pages

publish.el

@@ -21,7 +21,9 @@
       ;; not a notebook. Blocks are displayed verbatim.
       org-export-use-babel nil
       ;; Convert file:chapter.org links → chapter.html in HTML export
-      org-html-link-org-files-as-html t)
+      org-html-link-org-files-as-html t
+      ;; Don't try to maintain a global ID database in CI
+      org-id-track-globally nil)
 
 ;; Use htmlize for syntax highlighting when available
 (when (require 'htmlize nil t)