check.yml: Install tx to satisfy sphinx-intl

Author: rffontenelle

.github/workflows/check.yml

@@ -132,6 +132,11 @@ jobs:
       - name: setup
         run: ./scripts/setup.sh
 
+      - name: Install Transifex CLI tool
+        run: |
+          cd /usr/local/bin
+          curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash -s -- v$TX_CLI_VERSION
+
       - name: Add problem matcher
         uses: rffontenelle/sphinx-lint-problem-matcher@v1.0.0