Add UpCloud integration with account listing and details retrieval

Signed-off-by: Steven4Hooisma <112615049+Steven4Hooisma@users.noreply.github.com>

pkg/connector/provider/builtin.go

@@ -83,6 +83,7 @@ func NewBuiltinRegistry() *Registry {
 		supabaseRegistration(),
 		tailscaleRegistration(),
 		tallyRegistration(),
+		upcloudRegistration(),
 		vercelRegistration(),
 		yousignRegistration(),
 		zendeskRegistration(),

pkg/connector/provider/upcloud.go

@@ -0,0 +1,54 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package provider
+
+import (
+	"context"
+	"net/http"
+
+	"go.gearno.de/kit/log"
+	"go.probo.inc/probo/pkg/accessreview/drivers"
+	"go.probo.inc/probo/pkg/coredata"
+)
+
+func upcloudRegistration() *Registration {
+	return &Registration{
+		Provider:       coredata.ConnectorProviderUpCloud,
+		DisplayName:    "UpCloud",
+		SupportsAPIKey: true,
+		// UpCloud's newer API tokens (the "ucat_..." personal access tokens
+		// created under People > API access) authenticate as a standard
+		// Bearer token, so the default APIKeyConnection mode (Authorization:
+		// Bearer <key>) applies; no Header/Scheme/BasicAuth override is
+		// needed. There is no OAuth2 flow; account/list already returns the
+		// main account plus every sub-account reachable with the token, so
+		// there is nothing to pick or configure: no settings struct, no
+		// picker.
+		//
+		// ProbeURL lets the connection-status check confirm the token with
+		// the same lightweight GET the driver uses; an invalid token returns
+		// 401.
+		ProbeURL: "https://api.upcloud.com/1.3/account/list",
+		NewDriver: func(_ context.Context, c *http.Client, _ *coredata.Connector, logger *log.Logger) (drivers.Driver, error) {
+			return drivers.NewUpCloudDriver(c, logger), nil
+		},
+	}
+}