Add renovate comments to all `Earthfile`

[janishorsts]

In @EarthBuild repositories, @renovate-bot ensures the dependencies are up to date everywhere. However, not all dependencies are determined in the EarthFiles by @renovate-bot.

We use the following regex manager for EarthFile:

earthbuild/.github/renovate.json5

Lines 75 to 84 in bb8204a

	{
	customType: 'regex',
	description: "Update _version ARGs and ENVs in Earthfile",
	managerFilePatterns: [
	'/^Earthfile$/',
	],
	matchStrings: [
	'#\\s*renovate:\\s*datasource=(?<datasource>[a-z-]+?)(?:\\s+depName=(?<depName>.+?))?\\s+packageName=(?<packageName>.+?)(?:\\s+versioning=(?<versioning>[a-z-]+?))?\\s+(?:ENV|ARG)\\s+.+?(_VERSION|_VER|_version)=(?<currentValue>.+?)\\s',
	],
	},

Ensure we have the renovate comment where needed.

The comment applies to ENV, LET and ARG commands containing _version= or _VERSION.

    # renovate: datasource=go packageName=golang.org/x/vuln/cmd/govulncheck
    ENV govulncheck_version=1.1.3

    # renovate: datasource=go packageName=golang.org/x/vuln/cmd/govulncheck
    LET govulncheck_version=1.1.3

    # renovate: datasource=go packageName=golang.org/x/vuln/cmd/govulncheck
    ARG govulncheck_version=1.1.3

E.g.

earthbuild/Earthfile

Lines 162 to 164 in bb8204a

	# renovate: datasource=go packageName=golang.org/x/vuln/cmd/govulncheck
	ENV govulncheck_version=1.1.3
	RUN go install golang.org/x/vuln/cmd/govulncheck@v$govulncheck_version

[danielschlegel]

#220

[danielschlegel]

MR is merged.