Add support for the workspace show command

[lafentres]

Description

This PR adds support for the workspace show command.

Closes #239

Related links

• workspace show documentation

[radeksimko]

This LGTM, my only one reservation is that we aim to also more gracefully handle version differences in tfexec and this command in particular was introduced in v0.10 hashicorp/terraform@9d7fce2

Would you therefore mind adding a version check, similar to the one we have for fmt here?

terraform-exec/tfexec/fmt.go

Lines 129 to 132 in 750bc90

	err := tf.compatible(ctx, tf0_7_7, nil)
	if err != nil {
	return nil, fmt.Errorf("fmt was first introduced in Terraform 0.7.7: %w", err)
	}

FYI There's a more long-term issue tracking this problem for all commands #121

[lafentres]

This LGTM, my only one reservation is that we aim to also more gracefully handle version differences in tfexec and this command in particular was introduced in v0.10 hashicorp/terraform@9d7fce2

Would you therefore mind adding a version check, similar to the one we have for fmt here?

terraform-exec/tfexec/fmt.go

Lines 129 to 132 in 750bc90

	err := tf.compatible(ctx, tf0_7_7, nil)
	if err != nil {
	return nil, fmt.Errorf("fmt was first introduced in Terraform 0.7.7: %w", err)
	}

FYI There's a more long-term issue tracking this problem for all commands #121

excellent point! i've added a version check for this command and a little bit of extra testing :]

[radeksimko]

LGTM