Provide writable container temporary storage

docker-configs/docker-compose.yml

@@ -56,6 +56,7 @@ services:
             #- HDSTACK_BASEID=23400
             #- HDSTACK_BRIDGE_CONFIG=/opt/freedmr/freedmr-bridge.cfg
             #- HDSTACK_BRIDGE_RULES=/opt/freedmr/rules.py
+        tmpfs: /tmp
         read_only: "true"
 
     freedmrmonitor2:

tests/test_hdstack.py

@@ -284,6 +284,10 @@ class HDStackContainerTests(unittest.TestCase):
         self.assertIn('#- HDSTACK_BASEID=23400', compose)
         self.assertIn('#- HDSTACK_BRIDGE_CONFIG=', compose)
         self.assertIn('#- HDSTACK_BRIDGE_RULES=', compose)
+        self.assertIn(
+            '        tmpfs: /tmp\n        read_only: "true"',
+            compose,
+        )
 
     def test_image_has_no_obsolete_static_hdstack_supervisor(self):
         dockerfile = (DOCKER_CONFIGS / 'Dockerfile-ci').read_text(encoding='utf-8')