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/shared/keys/hashing.go

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+type Hasher interface {
+	Hash(key []byte) string
+}