CI: Push docs just as zip file

The action is already pushing the artifact as a zip file, and these
aren't large enough to warrant the xz compression step.

Download the artifact and look at the resultant directory.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

.github/workflows/docs.yml

@@ -56,13 +56,27 @@ jobs:
           cargo doc
           mv target/doc ../rustdocs/std
 
-      - name: Compress docs
-        working-directory: zephyr-rust-lang
-        run: |
-          tar --use-compress-program="xz -T0" -cf rustdocs.tar.xz rustdocs
-
       - name: Upload docs artifact
         uses: actions/upload-artifact@v4
         with:
           name: rustdocs
-          path: zephyr-rust-lang/rustdocs.tar.xz
+          path: zephyr-rust-lang/rustdocs
+
+  doc-publish:
+    name: Publish Rust Documentation
+    needs: generate-docs
+    runs-on: ubuntu-latest
+    if: |
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.repository == 'zephyrproject-rtos/zephyr-rust-lang'
+
+    steps:
+      - name: Download documentation artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: rustdocs
+
+      - name: Show our tree
+        run: |
+          find . -ls