ci/docs: Improve docs CI

- enable RBE
- add artifact uploads

Signed-off-by: Ryan Northey <ryan@synca.io>

Author: phlax

.github/workflows/docs.yml

@@ -43,6 +43,8 @@ jobs:
         export UID
         echo 'load("@envoy_examples//bazel:env.bzl", "envoy_examples_env")' >> ../envoy/WORKSPACE
         echo 'envoy_examples_env()' >> ../envoy/WORKSPACE
+        echo "--config=rbe" > ../envoy/repo.bazelrc
+        # echo "--config=ci" >> ../envoy/repo.bazelrc
         docker compose run docs
       working-directory: examples
       env:
@@ -53,3 +55,10 @@ jobs:
         BUILDKIT_PROGRESS: quiet
         COMPOSE_BAKE: true
         DOCKER_BUILDKIT: 1
+        GITHUB_TOKEN: ${{ github.token }}
+    - name: Docs upload
+      uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f  # v6.0.0
+      with:
+        name: docs
+        path: envoy/generated/docs
+        retention-days: 30