Configure Renovate

This adds a custom regex manager so dependencies in yml files can be found.

.github/renovate.json

@@ -0,0 +1,14 @@
+{
+	"$schema": "https://docs.renovatebot.com/renovate-schema.json",
+	"extends": [
+		"config:base"
+	],
+	"regexManagers": [
+		{
+			"fileMatch": [".*y[a]?ml$"],
+			"matchStrings": [
+				"# renovate: datasource=(?<datasource>[a-z-.]+?) depName=(?<depName>[^\\s]+?)(?: (?:lookupName|packageName)=(?<packageName>[^\\s]+?))?(?: versioning=(?<versioning>[a-z-0-9]+?))?\\s+[A-Za-z0-9_]+?_version\\s*:\\s*[\"']?(?<currentValue>.+?)[\"']?\\s"
+			]
+		}
+	]
+}