[Tests] add retry logic

Author: ljharb

.github/workflows/tests.yml

@@ -69,7 +69,19 @@ jobs:
       - run: npm ls urchin
       - run: npx which urchin
       - run: env
-      - run: make TERM=xterm-256color TEST_SUITE="${{ matrix.suite }}" SHELL="${{ matrix.shell }}" URCHIN="$(npx which urchin)" test-${{ matrix.shell }}
+      - name: Run tests
+        shell: bash
+        run: |
+          for attempt in 1 2 3; do
+            timeout 600 make TERM=xterm-256color TEST_SUITE="${{ matrix.suite }}" SHELL="${{ matrix.shell }}" URCHIN="$(npx which urchin)" test-${{ matrix.shell }} && exit 0
+            EXIT_CODE=$?
+            if [ $EXIT_CODE -ne 124 ]; then
+              exit $EXIT_CODE
+            fi
+            echo "Attempt ${attempt} timed out; retrying..."
+          done
+          echo "All 3 attempts timed out."
+          exit 1
 
   nvm:
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