feat: add gcp upload for docs

.github/workflows/docs.yml

@@ -36,4 +36,18 @@ jobs:
           pip install -r docs/source/requirements.txt
       - name: Build docs
         run: |
-          sphinx-build -M html docs/source docs/build
+          sphinx-build -M html docs/source docs/build
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+          - uses: actions/checkout@v4
+          name: Checkout
+      - name: Authenticate to Google Cloud
+        id: auth
+        uses: google-github-actions/auth@v1.1.1
+        with:
+          token_format: "access_token"
+          workload_identity_provider: ${{ vars.GCP_WORKLOAD_IDENTITY_PROVIDER }}
+          service_account: ${{ vars.GCP_SERVICE_ACCOUNT }}
+      - id: 'upload-file'
+        uses: 'google-github-actions/upload-cloud-storage@v2'
+        with:
+          path: 'docs/build/html/**'
+          destination: 'docs-bucket-production/semantic-router'
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