Add OpenTofu CLI support to Terraform plugin

Add OpenTofu as a new executable in the existing Terraform plugin,
allowing `tofu` commands to authenticate via 1Password shell plugins.

Closes #483

Author: ianneub

plugins/terraform/opentofu.go

@@ -0,0 +1,40 @@
+package terraform
+
+import (
+	"github.com/1Password/shell-plugins/sdk"
+	"github.com/1Password/shell-plugins/sdk/needsauth"
+	"github.com/1Password/shell-plugins/sdk/schema"
+)
+
+func OpenTofuCLI() schema.Executable {
+	return schema.Executable{
+		Name:    "OpenTofu CLI",
+		Runs:    []string{"tofu"},
+		DocsURL: sdk.URL("https://opentofu.org/docs/cli/"),
+		NeedsAuth: needsauth.IfAll(
+			needsauth.NotForHelpOrVersion(),
+			needsauth.NotWithoutArgs(),
+		),
+		Uses: []schema.CredentialUsage{
+			{
+				Description: "Credentials to use within the OpenTofu project",
+				SelectFrom: &schema.CredentialSelection{
+					ID:                    "project",
+					IncludeAllCredentials: true,
+					AllowMultiple:         true,
+				},
+				Optional: true,
+				NeedsAuth: needsauth.IfAny(
+					needsauth.ForCommand("refresh"),
+					needsauth.ForCommand("init"),
+					needsauth.ForCommand("state"),
+					needsauth.ForCommand("plan"),
+					needsauth.ForCommand("apply"),
+					needsauth.ForCommand("destroy"),
+					needsauth.ForCommand("import"),
+					needsauth.ForCommand("test"),
+				),
+			},
+		},
+	}
+}

plugins/terraform/plugin.go

@@ -14,6 +14,7 @@ func New() schema.Plugin {
 		},
 		Executables: []schema.Executable{
 			TerraformCLI(),
+			OpenTofuCLI(),
 		},
 	}
 }