fix: add SSL mount to Tailscale

Fixes 'x509: certificate signed by unknown authority'

Signed-off-by: Andrew Rynhard <andrew@rynhard.io>
(cherry picked from commit 5bf5413)

Author: andrewrynhard

network/tailscale/tailscale.yaml

@@ -59,4 +59,10 @@ container:
     options:
       - bind
       - rw
+  - source: /etc/ssl/certs
+    destination: /etc/ssl/certs
+    type: bind
+    options:
+      - rbind
+      - ro
 restart: always