[ruby] Include y(a)ml, xml, and erb files (#4846)

joern-cli/frontends/rubysrc2cpg/src/main/scala/io/joern/rubysrc2cpg/passes/ConfigFileCreationPass.scala

@@ -16,5 +16,16 @@ class ConfigFileCreationPass(cpg: Cpg) extends XConfigFileCreationPass(cpg) {
     case None           => Seq()
   }
 
-  override protected val configFileFilters: List[File => Boolean] = List(validGemfilePaths.contains)
+  override protected val configFileFilters: List[File => Boolean] = List(
+    // Gemfiles
+    validGemfilePaths.contains,
+    extensionFilter(".ini"),
+    // YAML files
+    extensionFilter(".yaml"),
+    extensionFilter(".yml"),
+    // XML files
+    extensionFilter(".xml"),
+    // ERB files
+    extensionFilter(".erb")
+  )
 }

joern-cli/frontends/rubysrc2cpg/src/test/scala/io/joern/rubysrc2cpg/passes/ConfigFileCreationPassTests.scala

@@ -0,0 +1,60 @@
+package io.joern.rubysrc2cpg.passes
+
+import io.joern.rubysrc2cpg.testfixtures.RubyCode2CpgFixture
+import io.shiftleft.semanticcpg.language.*
+
+class ConfigFileCreationPassTests extends RubyCode2CpgFixture {
+
+  "yaml files should be included" in {
+    val cpg = code(
+      """
+        |foo:
+        |  bar
+        |""".stripMargin,
+      "config.yaml"
+    )
+
+    val config = cpg.configFile.name("config.yaml").head
+    config.content should include("foo:")
+  }
+
+  "yml files should be included" in {
+    val cpg = code(
+      """
+        |foo:
+        |  bar
+        |""".stripMargin,
+      "config.yml"
+    )
+
+    val config = cpg.configFile.name("config.yml").head
+    config.content should include("foo:")
+  }
+
+  "xml files should be included" in {
+    val cpg = code(
+      """
+        |<foo>
+        |  <p>bar<p>
+        |</foo>
+        |""".stripMargin,
+      "config.xml"
+    )
+
+    val config = cpg.configFile.name("config.xml").head
+    config.content should include("<p>bar<p>")
+  }
+
+  "erb files should be included" in {
+    val cpg = code(
+      """
+        |<%= 1 + 2 %>
+        |""".stripMargin,
+      "foo.erb"
+    )
+
+    val config = cpg.configFile.name("foo.erb").head
+    config.content should include("1 + 2")
+  }
+
+}