Add more ghost config options

[prksu]

Is your feature request related to a problem? Please describe.
Currently, only url and database that can be configured within this operator. see

ghost-operator/pkg/apis/ghost/v1alpha1/ghostapp_types.go

Lines 56 to 62 in 2066cb9

	// GhostConfigSpec defines related ghost configuration based on https://ghost.org/docs/concepts/config
	// TODO (prksu): we need support all ghost configuration since we reference this spec as ghost config too.
	type GhostConfigSpec struct {
	URL string `json:"url"`
	Database GhostDatabaseSpec `json:"database"`
	}

Describe the solution you'd like
We should add more config options. see https://ghost.org/docs/concepts/config/ for detail ghost config

/kind feature
/help
/good-first-issue

[prksu-bot]

@prksu:
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In response to this:

Is your feature request related to a problem? Please describe.
Currently, only url and database that can be configured within this operator. see

ghost-operator/pkg/apis/ghost/v1alpha1/ghostapp_types.go

Lines 56 to 62 in 2066cb9

	// GhostConfigSpec defines related ghost configuration based on https://ghost.org/docs/concepts/config
	// TODO (prksu): we need support all ghost configuration since we reference this spec as ghost config too.
	type GhostConfigSpec struct {
	URL string `json:"url"`
	Database GhostDatabaseSpec `json:"database"`
	}

Describe the solution you'd like
We should add more config options. see https://ghost.org/docs/concepts/config/ for detail ghost config

/kind feature
/help
/good-first-issue

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