[full-ci] Add Gateway flag to default config

[refs]

This is needed in order to provide Reva with a valid configuration. This is only a patch until a more robust solution is found as it keeps the nightly builds from passing.

It also improves config parsing by memoizing the cli flags parsed for a given storage subcommand, preventing unnecessary code execution when iterating over flags and applying them to the flagset.

Description

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[refs]

The small smoke test I had to verify this on reva side is essentially:

func (c *config) init() {
	if c.Network == "" {
		c.Network = "tcp"
	}

	if c.Address == "" {
		panic("beep, empty")
		c.Address = sharedconf.GetGatewaySVC("0.0.0.0:19000")
	}
}

no panic condition was triggered with this patch.

[sonarqubecloud]

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