Ruby: Recognise File.atomic_write as a file writer

This method is an ActiveSupport extension, but there's no harm in
recognising it universally as any identically-named method is likely to
also be a file writer.

Author: hmac

ruby/ql/lib/codeql/ruby/frameworks/core/internal/IOOrFile.qll

@@ -137,7 +137,7 @@ class IOOrFileWriteMethodCall extends IOOrFileMethodCall {
       receiverKind = "class" and
       api = ["IO", "File"] and
       this = API::getTopLevelMember(api).getAMethodCall(methodName) and
-      methodName = ["binwrite", "write"] and
+      methodName = ["binwrite", "write", "atomic_write"] and
       dataNode = this.getArgument(1)
       or
       // e.g. `{IO,File}.new("foo.txt", "a+).puts("hello")`

ruby/ql/test/library-tests/frameworks/files/Files.expected

@@ -76,6 +76,8 @@ fileSystemAccesses
 | Files.rb:41:1:41:26 | call to open |
 | Files.rb:41:1:41:43 | call to write |
 | Files.rb:48:1:48:40 | call to printf |
+| Files.rb:49:1:49:30 | call to write |
+| Files.rb:50:1:50:37 | call to atomic_write |
 fileNameSources
 | Files.rb:10:6:10:18 | call to path |
 | Files.rb:11:6:11:21 | call to to_path |
@@ -86,7 +88,11 @@ fileWriters
 | Files.rb:40:1:40:22 | call to puts |
 | Files.rb:41:1:41:43 | call to write |
 | Files.rb:48:1:48:40 | call to printf |
+| Files.rb:49:1:49:30 | call to write |
+| Files.rb:50:1:50:37 | call to atomic_write |
 fileSystemWriteAccesses
 | Files.rb:40:1:40:22 | call to puts |
 | Files.rb:41:1:41:43 | call to write |
 | Files.rb:48:1:48:40 | call to printf |
+| Files.rb:49:1:49:30 | call to write |
+| Files.rb:50:1:50:37 | call to atomic_write |

ruby/ql/test/library-tests/frameworks/files/Files.rb

@@ -46,3 +46,5 @@
 int_1 = 123
 # File/IO write
 io_file.printf("%s: %d\n", str_1, int_1)
+File.write("foo.txt", "hello")
+File.atomic_write("foo.txt", "hello")