[new] Add Terraform provider petstore sample and acceptance tests

Add sample generation config and generated Terraform provider for the
petstore OpenAPI spec, along with Go acceptance tests that exercise
the provider lifecycle (create, read, update, delete, import).

Generated output includes:
- Provider with auth configuration (API key, bearer, basic)
- Pet, User, and Store resources and data sources
- Client package with HTTP client and model structs
- Go acceptance tests using terraform-plugin-testing
- Example Terraform configurations for each resource/data source

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jasondamour

bin/configs/terraform-provider-petstore-new.yaml

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+generatorName: terraform-provider
+outputDir: samples/client/petstore/terraform
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore.yaml
+templateDir: modules/openapi-generator/src/main/resources/terraform-provider
+gitHost: github.com
+gitUserId: example
+gitRepoId: terraform-provider-petstore
+additionalProperties:
+  providerName: "petstore"
+  providerAddress: "registry.terraform.io/example/petstore"
+  hideGenerationTimestamp: "true"

samples/client/petstore/terraform/.gitignore

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+*.dll
+*.exe
+*.exe~
+*.dylib
+*.so
+*.test
+*.out
+*.tfstate
+*.tfstate.*
+.terraform/
+terraform.tfvars
+terraform-provider-petstore

samples/client/petstore/terraform/.openapi-generator-ignore

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+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/petstore/terraform/.openapi-generator/FILES

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+.gitignore
+GNUmakefile
+README.md
+examples/provider/provider.tf
+go.mod
+internal/client/client.go
+internal/client/model_api_response.go
+internal/client/model_category.go
+internal/client/model_order.go
+internal/client/model_pet.go
+internal/client/model_tag.go
+internal/client/model_user.go
+internal/provider/pet_data_source.go
+internal/provider/pet_model.go
+internal/provider/pet_resource.go
+internal/provider/provider.go
+internal/provider/store_data_source.go
+internal/provider/store_model.go
+internal/provider/store_resource.go
+internal/provider/user_data_source.go
+internal/provider/user_model.go
+internal/provider/user_resource.go
+main.go

samples/client/petstore/terraform/.openapi-generator/VERSION

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+7.20.0-SNAPSHOT

samples/client/petstore/terraform/GNUmakefile

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+default: testacc
+
+# Run acceptance tests
+.PHONY: testacc
+testacc:
+	TF_ACC=1 go test ./... -v $(TESTARGS) -timeout 120m
+
+# Build provider
+.PHONY: build
+build:
+	go build -o terraform-provider-petstore
+
+# Install provider locally
+.PHONY: install
+install: build
+	mkdir -p ~/.terraform.d/plugins/registry.terraform.io/example/petstore/0.1.0/$(shell go env GOOS)_$(shell go env GOARCH)
+	mv terraform-provider-petstore ~/.terraform.d/plugins/registry.terraform.io/example/petstore/0.1.0/$(shell go env GOOS)_$(shell go env GOARCH)/
+
+# Generate documentation
+.PHONY: docs
+docs:
+	go generate ./...
+
+# Run linter
+.PHONY: lint
+lint:
+	golangci-lint run ./...

samples/client/petstore/terraform/README.md

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+# Terraform Provider petstore
+
+This Terraform provider was generated using [OpenAPI Generator](https://openapi-generator.tech).
+
+## Requirements
+
+- [Terraform](https://www.terraform.io/downloads.html) >= 1.0
+- [Go](https://golang.org/doc/install) >= 1.21
+
+## Building The Provider
+
+1. Clone the repository
+2. Enter the repository directory
+3. Build the provider using the Go `install` command:
+
+```shell
+go install
+```
+
+## Using the provider
+
+```hcl
+terraform {
+  required_providers {
+    petstore = {
+      source = "registry.terraform.io/example/petstore"
+    }
+  }
+}
+
+provider "petstore" {
+  endpoint = "http://petstore.swagger.io/v2"
+}
+```
+
+## Developing the Provider
+
+If you wish to work on the provider, you'll first need [Go](http://www.golang.org) installed on your machine (see [Requirements](#requirements) above).
+
+To compile the provider, run `go install`. This will build the provider and put the provider binary in the `$GOPATH/bin` directory.
+
+To generate or update documentation, run `go generate`.
+
+In order to run the full suite of Acceptance tests, run `make testacc`.
+
+```shell
+make testacc
+```

samples/client/petstore/terraform/examples/data-sources/pet/data-source.tf

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+data "petstore_pet" "example" {
+  name       = "fido"
+  photo_urls = "https://example.com/fido.jpg"
+}
+
+output "pet_status" {
+  value = data.petstore_pet.example.status
+}

samples/client/petstore/terraform/examples/data-sources/user/data-source.tf

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+data "petstore_user" "example" {
+  username = "johndoe"
+}
+
+output "user_email" {
+  value = data.petstore_user.example.email
+}

samples/client/petstore/terraform/examples/provider/provider.tf

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+terraform {
+  required_providers {
+    petstore = {
+      source = "registry.terraform.io/example/petstore"
+    }
+  }
+}
+
+provider "petstore" {
+  endpoint = "http://petstore.swagger.io/v2"
+  # api_key  = "your-api-key"
+  # token    = "your-bearer-token"
+}