This is related to the discussion on the integrations/terraform-provider-github#1262

In June GitHub made the environments and environment protection rules generally available, however, the wait_timer and reviewers remains limited to enterprise.

Many developers would like to make use of this great new feature, but the bug in the Terraform provider currently proves to be a blocker.
The provider uses the go-github Go library under the hood and makes the following call:

_, _, err := client.Repositories.CreateUpdateEnvironment(ctx, owner, repoName, escapedEnvName, &updateData)

where the &updateData is a github.CreateUpdateEnvironment struct.

Looking at the code it seems that instead of sending nil value for wait_timer it defaults to 0.

// CreateUpdateEnvironment represents the fields required for the create/update operation
// following the Create/Update release example.
// See https://github.com/google/go-github/issues/992 for more information.
// Removed omitempty here as the API expects null values for reviewers and deployment_branch_policy to clear them.
type CreateUpdateEnvironment struct {
	WaitTimer              *int            `json:"wait_timer"`
	Reviewers              []*EnvReviewers `json:"reviewers"`
	DeploymentBranchPolicy *BranchPolicy   `json:"deployment_branch_policy"`
}

This is causing the issue for us, as the API doesn't expect this parameter and returns 422.

I understand why the omitempty was removed, so I'm looking at what alternative solutions are possible to ensure environments fully work regardless of the payment plan.