Tweak update task

misc/docker_start.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
-inv update
+inv update --no-update-deps
 exec supervisord -n -c misc/docker-supervisord.conf

tasks.py

@@ -146,9 +146,11 @@ def install_deps(ctx):
     run("poetry install", pty=True, echo=True)
 
 
-@task(compile_scss, migrate_db)
-def update(ctx):
-    # type: (Context) -> None
+@task(pre=[compile_scss], post=[migrate_db])
+def update(ctx, update_deps=True):
+    # type: (Context, bool) -> None
+    if update_deps:
+        run("poetry install", pty=True, echo=True)
     print("Done")