Database SKU settings by environment

[RudyCo]

Default SKU values:

"sku": {
	"name": "Basic",
	"tier": "Basic",
	"capacity": 5
}

SKU values may be overriden for each environment:

DATABASE_SKU_NAME
DATABASE_SKU_TIER
DATABASE_SKU_CAPACITY

[RudyCo]

This PR is created because of #9.

[RudyCo]

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