Write `customManagers` entry to update `renovateVersion` string in Markdown files

[HonkingGoose]

We want to get updates from Renovate bot for the renovateVersion string in the FAQ Markdown file.

How?

@rarkins proposed:

I think that using npm or Docker versions as "close enough" is good enough for us. We won't want to update this all the time either, e.g. we could update this monthly like we do with renovate versions in other docs.

Source:

• docs(faq): update Renovate version in example renovate#32054 (comment)

Todos

I don't know enough to write the new Renovate configuration. I hope someone smart at regex can help! Here are the todos:

Write new config code in default.json:

• Write a new customManagers entry, to update the "renovateVersion": "38.120.1" pattern string in Markdown files.
• Use the version of Renovate from npm, or Docker as "close enough" approximation of the version of the Mend hosted Renovate app.
• Set the schedule to monthly (or match the schedule for the other Markdown docs updates).

[viceice]

i think this simply needs another regex added here:

.github/default.json

Lines 140 to 151 in bf45bb3

	{
	"customType": "regex",
	"description": "Update Renovate and other docker images references in Markdown files",
	"fileMatch": ["\\.md$"],
	"matchStrings": [
	"(?<depName>renovate/renovate):(?<currentValue>[a-z0-9.-]+)(?:@(?<currentDigest>sha256:[a-f0-9]+))?",
	"(?<depName>ghcr.io/renovatebot/renovate):(?<currentValue>[a-z0-9.-]+)(?:@(?<currentDigest>sha256:[a-f0-9]+))?",
	"\\simage: (?<depName>.+?):(?<currentValue>[a-z0-9.-]+)(?:@(?<currentDigest>sha256:[a-f0-9]+))?"
	],
	"datasourceTemplate": "docker",
	"versioningTemplate": "docker"
	},