Add basic container healthcheck (#2625)

docker-compose.yml

@@ -26,3 +26,7 @@ services:
     stop_grace_period: 1m
     cap_add:
       - NET_ADMIN
+    healthcheck:
+      test: "ss --listening --tcp | grep -P 'LISTEN.+:smtp' || exit 1"
+      timeout: 3s
+      retries: 0

test/tests.bats

@@ -37,6 +37,7 @@ setup_file() {
     -e VIRUSMAILS_DELETE_DELAY=7 \
     -h mail.my-domain.com \
     --tty \
+    --health-cmd "ss --listening --tcp | grep -P 'LISTEN.+:smtp' || exit 1" \
     "${NAME}"
 
   wait_for_finished_setup_in_container mail
@@ -1206,6 +1207,16 @@ EOF
   assert_failure
 }
 
+#
+# healthcheck
+#
+
+@test "checking container healthcheck" {
+  run bash -c "docker inspect mail | jq -r '.[].State.Health.Status'"
+  assert_output "healthy"
+  assert_success
+}
+
 #
 # supervisor
 #