metropolis: stub out log service

The server side and client-side implementations are not quite ready yet,
but we're commiting this early so that we can start implementing more
node-local management RPCs.

Change-Id: I81b615b0f77dc7750cc738d60ee4923c3182721b
Reviewed-on: https://review.monogon.dev/c/monogon/+/1429
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/proto/ext/authorization.proto b/metropolis/proto/ext/authorization.proto
index 0275bba..12780f7 100644
--- a/metropolis/proto/ext/authorization.proto
+++ b/metropolis/proto/ext/authorization.proto
@@ -24,6 +24,7 @@
     PERMISSION_UPDATE_NODE_SELF = 3;
     PERMISSION_APPROVE_NODE = 4;
     PERMISSION_UPDATE_NODE_ROLES = 5;
+    PERMISSION_READ_NODE_LOGS = 6;
 }
 
 // Authorization policy for an RPC method. This message/API does not have the