feat: restructure project and fix vault/sdk version

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

cmd/vault-auth-tee/main.go

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) HashiCorp, Inc.
+// Copyright (c) Matter Labs
+
+package main
+
+import (
+	"github.com/matter-labs/vault-auth-tee"
+	"os"
+
+	hclog "github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/vault/api"
+	"github.com/hashicorp/vault/sdk/plugin"
+)
+
+func main() {
+	apiClientMeta := &api.PluginAPIClientMeta{}
+	flags := apiClientMeta.FlagSet()
+	flags.Parse(os.Args[1:])
+
+	tlsConfig := apiClientMeta.GetTLSConfig()
+	tlsProviderFunc := api.VaultPluginTLSProvider(tlsConfig)
+
+	if err := plugin.ServeMultiplex(&plugin.ServeOpts{
+		BackendFactoryFunc: vault_auth_tee.Factory,
+		// set the TLSProviderFunc so that the plugin maintains backwards
+		// compatibility with Vault versions that don’t support plugin AutoMTLS
+		TLSProviderFunc: tlsProviderFunc,
+	}); err != nil {
+		logger := hclog.New(&hclog.LoggerOptions{})
+
+		logger.Error("plugin shutting down", "error", err)
+		os.Exit(1)
+	}
+}