internal: handle empty API URL from env (#292) #272

Job	Run time
test / golangci-lint	3m 10s
test / migrate-down	15s
test / migrate-test	24s
test / schema-plan	0s
test / monitoring	34s
test / schema-apply (lint-review)	12s
test / schema-apply (on-the-fly, true)	9s
test / schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	7s
test / schema-plan-approve	7s
test / schema-push	9s
test / schema-test	10s
test / schema-apply (local-plan, file://20240910173744.plan.hcl)	7s
test / schema-apply (multiple-envs, file://20240910173744.plan.hcl)	9s
test / shim	11s
test / schema-apply (legacy, v0.27.0, true)	11s
test / shim-e2e	7s
test / unit-tests	1m 23s
build	32s
e2e-test	7s
	8m 4s

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