docs: add footer with CNCF trademark notice

Signed-off-by: Joseph Marrero Corchado <jmarrero@redhat.com>

Author: jmarrero

.github/workflows/docs.yml

@@ -52,6 +52,9 @@ jobs:
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
+      - name: Install mdbook_header_footer
+        run: |
+          cargo install mdbook_header_footer
       - name: Build with mdBook
         run: cd docs && mdbook-mermaid install && mdbook build
       - name: Upload artifact

docs/book.toml

@@ -8,6 +8,12 @@ title = "bootc"
 [preprocessor.mermaid]
 command = "mdbook-mermaid"
 
+[preprocessor.header-footer]
+headers = []
+footers = [
+  { padding = "\n---\n<p style=\"font-size:11px\">The Linux Foundation® (TLF) has registered trademarks and uses trademarks. For a list of TLF trademarks, see <a href=\"https://www.linuxfoundation.org/trademark-usage/\">Trademark Usage.</a></p>" }
+]
+
 [output.html]
 additional-js = ["mermaid.min.js", "mermaid-init.js"]