🐛(summary) fix hot reloading in tilt stack for summary image/pod

Remove default unprivileged Docker user that was incompatible with hot
reloading in tilt stack. Update tilt config to resolve path issues.

CI builds still use unprivileged user, making this change safe while
enabling proper development workflow with hot reloading functionality.

bin/Tiltfile

@@ -58,10 +58,10 @@ docker_build(
     'localhost:5001/meet-summary:latest',
     context='../src/summary',
     dockerfile='../src/summary/Dockerfile',
-    only=['.', '../../docker', '../../.dockerignore'],
+    only=['.'],
     target = 'production',
     live_update=[
-        sync('../src/summary', '/home/summary'),
+        sync('../src/summary', '/app'),
     ]
 )
 clean_old_images('localhost:5001/meet-summary')

src/summary/Dockerfile

@@ -12,11 +12,11 @@ FROM base AS production
 
 WORKDIR /app
 
+# Un-privileged user running the application
+ARG DOCKER_USER
+USER ${DOCKER_USER}
+
 COPY --from=builder /usr/local /usr/local
 COPY ./summary /app/summary
 
-# Un-privileged user running the application
-ARG DOCKER_USER=1000:1000
-USER ${DOCKER_USER}
-
 CMD ["uvicorn", "summary.main:app", "--proxy-headers", "--host", "0.0.0.0", "--port", "8000"]