Add missing quote

Author: raulcd

docker-compose.yml

@@ -1868,7 +1868,7 @@ services:
         /arrow/ci/scripts/cpp_build.sh /arrow /build &&
         /arrow/ci/scripts/python_build.sh /arrow /build &&
         /arrow/ci/scripts/c_glib_build.sh /arrow /build &&
-        /arrow/ci/scripts/r_build.sh /arrow /build
+        /arrow/ci/scripts/r_build.sh /arrow /build"
 
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