ci: limit each test attempt to 35 minutes (#7900)

* ci: limit each test attempt to 35 minutes

* ci: reword the timed-out attempt line in the CI guide

scripts/ci/README.md

@@ -44,7 +44,7 @@ The reduced build runs one Linux job, build-linux (ubuntu-22.04 x86_64), for eve
   - Docker image (step "Build and cache Docker image");
   - caches (the steps "Restore ... from cache");
   - `cabal build -j --enable-tests --ghc-options=-O0` (step "Build CLI");
-  - simplex-chat-test with the selected tests (step "Run tests").
+  - simplex-chat-test with the selected tests (step "Run tests"), each attempt limited to 35 minutes by `timeout`; an attempt that reaches the limit fails, and "Attempt <n> timed out." is printed.
 - Local:
   ```sh
   cp scripts/cabal.project.local.linux cabal.project.local

scripts/ci/run-tests.sh

@@ -26,7 +26,10 @@ attempts=${ATTEMPTS:-1}
 while [ "$i" -le "$attempts" ]; do
   if "$@" "${args[@]}"; then
     break
-  elif [ "$i" -lt "$attempts" ]; then
+  elif [ "$?" -eq 124 ]; then
+    echo "Attempt $i timed out."
+  fi
+  if [ "$i" -lt "$attempts" ]; then
     echo "Attempt $i failed, retrying..."
     sleep 1
   fi