[docs] Install gems with --user-install

.github/workflows/deploy_docs.yaml

@@ -21,17 +21,12 @@ jobs:
 
       - name: Install Asciidoctor and Asciidoctor-Diagram
         run: |
-          gem install asciidoctor asciidoctor-diagram asciidoctor-pdf
-
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y make  # Install make if not available
+          gem install asciidoctor asciidoctor-diagram asciidoctor-pdf --user-install
 
       - name: Run Make
         run: |
-          cd docs  # Changes directory to where the Makefile is located
-          make ci  # Executes your Make target that builds docs
+          cd doc  # Changes directory to where the Makefile is located
+          PATH=${{ github.workspace }}/.gem/bin:$PATH make ci
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3