fix warnings-as-errors typo - #4787

Process completed with exit code 1.

The command WITH DOCKER RUN --privileged set -e; timeout=$(expr $(date +%!s(MISSING)) + 60); docker run --name mssql --network=host -d -e 'ACCEPT_EULA=Y' -e 'MSSQL_SA_PASSWORD=some!Password' "$MCR_IMG"; docker run --name pg --network=host -d -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=postgres "$PG_IMG"; docker run --name mysql --network=host -d -e MYSQL_ROOT_PASSWORD=root "$MYSQL_IMG"; while ! sqlcmd -C -S tcp:127.0.0.1,1433 -U sa -P 'some!Password' -Q "SELECT 1" >/dev/null 2>&1; do test "$(date +%!s(MISSING))" -le "$timeout" || (echo "timed out waiting for mssql"; exit 1); echo "waiting for mssql"; sleep 1; done; while ! pg_isready --host=127.0.0.1 --port=5432 --quiet; do test "$(date +%!s(MISSING))" -le "$timeout" || (echo "timed out waiting for postgres"; exit 1); echo "waiting for postgres"; sleep 1; done; while ! mysqladmin ping --host=127.0.0.1 --port=3306 --protocol=TCP --silent; do test "$(date +%!s(MISSING))" -le "$timeout" || (echo "timed out waiting for mysql"; exit 1); echo "waiting for mysql"; sleep 1; done; MSSQL_URL='sa:xxxxx@127.0.0.1' MYSQL_URL='root:xxxxx@127.0.0.1' PG_URL='postgres:xxxxx@127.0.0.1' ECTO_PATH='/src/ecto' mix test.all; did not complete successfully. Exit code 1

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