🔧(tilt) use the same user as in production to facilitate testing

Use the same user as in production to facilitate local testing with
the production image.

Assign group 127 to the docker user to mirror CI and match production
practices, even though the rationale for this group mapping is unclear.

bin/Tiltfile

@@ -18,6 +18,7 @@ docker_build(
     'localhost:5001/meet-backend:latest',
     context='..',
     dockerfile='../Dockerfile',
+    build_args={'DOCKER_USER': '1001:127'},
     only=['./src/backend', './src/mail', './docker'],
     target = 'backend-production',
     live_update=[
@@ -33,6 +34,7 @@ clean_old_images('localhost:5001/meet-backend')
 docker_build(
     'localhost:5001/meet-frontend-dinum:latest',
     context='..',
+    build_args={'DOCKER_USER': '1001:127'},
     dockerfile='../docker/dinum-frontend/Dockerfile',
     only=['./src/frontend', './docker', './.dockerignore'],
     target = 'frontend-production',
@@ -57,6 +59,7 @@ clean_old_images('localhost:5001/meet-frontend-generic')
 docker_build(
     'localhost:5001/meet-summary:latest',
     context='../src/summary',
+    build_args={'DOCKER_USER': '1001:127'},
     dockerfile='../src/summary/Dockerfile',
     only=['.'],
     target = 'production',
@@ -69,6 +72,7 @@ clean_old_images('localhost:5001/meet-summary')
 docker_build(
     'localhost:5001/meet-agents:latest',
     context='../src/agents',
+    build_args={'DOCKER_USER': '1001:127'},
     dockerfile='../src/agents/Dockerfile',
     only=['.'],
     target = 'production',