refactor(ci): use artifact output path

Signed-off-by: Victor Adossi <vadossi@cosmonic.com>

Author: vados-cosmonic

.github/actions/mdbook/action.yml

@@ -38,8 +38,6 @@ inputs:
     default: "0.7.7"
     description: |
       Version of mdbook-linkcheck to use (ex. '0.7.7')
-env:
-  ARTIFACT_PATH: ./component-model/book/html
 
 runs:
   using: composite
@@ -60,15 +58,18 @@ runs:
       with:
         tool: "mdbook-linkcheck@${{ inputs.mdbook-linkcheck-version }}"
 
-    - name: Build with mdBook
-      shell: bash
-      run: mdbook build component-model
-
     - name: Setup Python
       uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
       with:
         python-version: '3.13'
 
+    - name: Build with mdBook
+      shell: bash
+      id: book-build
+      run: |
+        just build-book
+        echo "output-path=$(just print-book-dir)" >> $GITHUB_OUTPUT
+
     - name: Generate sitemap
       shell: bash
       run: |
@@ -92,4 +93,4 @@ runs:
       if: ${{ inputs.publish-pages-artifact }}
       uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
       with:
-        path: ${{ env.ARTIFACT_PATH }}
+        path: ${{ steps.book-build.outputs.output-path }}

justfile

@@ -3,6 +3,7 @@ just_dir := env_var_or_default("JUST_DIR", justfile_directory())
 
 python := env_var_or_default("PYTHON", "python3")
 cargo := env_var_or_default("CARGO", "cargo")
+mdbook := env_var_or_default("MDBOOK", "mdbook")
 
 publish_domain := env_var_or_default("PUBLISH_DOMAIN", "component-model.bytecodealliance.org")
 
@@ -14,12 +15,21 @@ book_output_dir := env_var_or_default("BOOK_OUTPUT_DIR", "./component-model/book
 @_default:
     {{just}} --list
 
+# Print the directory the book was output to
+[group('meta')]
+@print-book-dir:
+    echo -n {{book_output_dir}}
+
+# Build the book
+[group('build')]
+@build-book:
+    {{mdbook}} build component-model
+
 # Build the sitemap
+[group('build')]
 @build-sitemap:
     {{python}} {{scripts_dir}}/generate_sitemap.py --domain "{{publish_domain}}" --higher-priority "design" --output-path {{sitemap_output_path}}
     if [ ! -f "{{book_output_dir}}/index.html" ]; then \
       echo "[error] index.html @ [{{book_output_dir}}] is missing. Build or path misconfigured"; \
       exit 1; \
     fi
-
-