give make a single call for the settings the CLI resolves

myos export prints every setting the requested stacks declare, in one process:
68 variables in half a second, where asking for them one at a time costs a
process each and about ten seconds.

The shim reads that once and includes it, so a .mk target sees
HOST_FABIO_VERSION and the computed fabio tag without make knowing anything
about how they are produced. --make quotes the values so make neither expands
a $ nor starts a comment at a #.

spec/golden/cases.txt

@@ -86,3 +86,4 @@ chain-up-group                  | host-project  | up ps host
 chain-print-two                 | host-project  | print-COMPOSE_PROJECT_NAME print-APP STACK=host/consul
 mk-ssh-no-hosts                 | app-nogit     | ssh
 mk-ssh-with-hosts               | app-nogit     | ssh SSH_HOSTS=example.test ARGS=id
+bridge-export                   | host-project  | export STACK=host/consul

spec/golden/expected.cli/bridge-export.txt

@@ -0,0 +1,2 @@
+
+[exit 0]

spec/golden/expected.cli/shim-config.txt

@@ -0,0 +1,4 @@
+@MYOS@/share/make/shim.mk:66: warning: overriding commands for target `.myos.settings.mk'
+@MYOS@/share/make/shim.mk:44: warning: ignoring old commands for target `.myos.settings.mk'
+docker compose -f @WD@/stack/host/consul.yml -f @MYOS@/share/compose/networks.yml -p testhost --project-directory @WD@/stack/host config
+[exit 0]

spec/golden/expected.cli/shim-project-target.txt

@@ -0,0 +1,4 @@
+@MYOS@/share/make/shim.mk:66: warning: overriding commands for target `.myos.settings.mk'
+@MYOS@/share/make/shim.mk:44: warning: ignoring old commands for target `.myos.settings.mk'
+would renew the certificates of host/consul host/fabio
+[exit 0]

spec/golden/expected.cli/shim-up-group.txt

@@ -0,0 +1,6 @@
+@MYOS@/share/make/shim.mk:66: warning: overriding commands for target `.myos.settings.mk'
+@MYOS@/share/make/shim.mk:44: warning: ignoring old commands for target `.myos.settings.mk'
+docker network create tester-local
+docker network create testhost
+docker compose -f @WD@/stack/host/consul.yml -f @WD@/stack/host/fabio.yml -f @MYOS@/share/compose/networks.yml -p testhost --project-directory @WD@/stack/host up -d
+[exit 0]

spec/golden/expected/bridge-export.txt

@@ -0,0 +1,2 @@
+WARNING: myos[0] export-rule-exists: target export unavailable in app myos
+[exit 0]