Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/services/cgroups/iface.go

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package cgroups
+
+type ProcessType string
+
+const (
+	ProcessTypePTY   ProcessType = "pty"
+	ProcessTypeUser  ProcessType = "user"
+	ProcessTypeSocat ProcessType = "socat"
+)
+
+type Manager interface {
+	GetFileDescriptor(procType ProcessType) (int, bool)
+	Close() error
+}