fix(docker): constrain greenlet<3.4.0 for arm64 Docker builds

greenlet 3.4.0 lacks manylinux_2_41_aarch64 wheels. Use a UV_CONSTRAINT
file instead of the workspace lock file (which doesn't work in the
single-package Docker context).

Author: nicoloboschi

docker/standalone/Dockerfile

@@ -41,21 +41,23 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/* \
     && pip install --no-cache-dir uv
 
-# Copy dependency files, lock file, and README (required by pyproject.toml)
+# Copy dependency files and README (required by pyproject.toml)
 COPY hindsight-api-slim/pyproject.toml ./api/
 COPY hindsight-api-slim/README.md ./api/
-COPY uv.lock ./api/
+COPY docker/standalone/constraints.txt /tmp/constraints.txt
 
 WORKDIR /app/api
 
 # Sync dependencies using appropriate extras based on INCLUDE_LOCAL_MODELS
 # local-ml: torch, sentence-transformers, transformers, einops, flashrank, mlx (optional)
 # embedded-db: pg0-embedded (always included for embedded PostgreSQL support)
+ENV UV_CONSTRAINT=/tmp/constraints.txt
 RUN if [ "$INCLUDE_LOCAL_MODELS" = "true" ]; then \
-        uv sync --frozen --extra local-ml --extra embedded-db; \
+        uv sync --extra local-ml --extra embedded-db; \
     else \
-        uv sync --frozen --extra embedded-db; \
+        uv sync --extra embedded-db; \
     fi
+ENV UV_CONSTRAINT=
 
 # Copy source code (alembic migrations are inside hindsight_api/)
 COPY hindsight-api-slim/hindsight_api ./hindsight_api

docker/standalone/constraints.txt

@@ -0,0 +1,2 @@
+# greenlet 3.4.0 lacks arm64 wheels for manylinux_2_41 — remove this cap once 3.4.1+ ships with them
+greenlet<3.4.0