fix(docker): lower default build memory (#2420)

Dockerfile

@@ -11,7 +11,13 @@
 # ==========================================================================
 FROM rust:1.93-bookworm AS builder
 
-ENV DEBIAN_FRONTEND=noninteractive
+# Docker builds often run on small VPS/CI builders. The crate's `ci` profile
+# keeps peak rustc memory lower than `release`; override with
+# `--build-arg CARGO_PROFILE=release` when maximum runtime optimization matters.
+ARG CARGO_PROFILE=ci
+ARG CARGO_BUILD_JOBS=1
+ENV DEBIAN_FRONTEND=noninteractive \
+    CARGO_BUILD_JOBS=${CARGO_BUILD_JOBS}
 
 # System dependencies required for compilation.
 #
@@ -43,14 +49,15 @@ COPY Cargo.toml Cargo.lock rust-toolchain.toml ./
 RUN mkdir -p src && \
     echo 'fn main() {}' > src/main.rs && \
     echo 'pub fn run_core_from_args(_: &[String]) -> anyhow::Result<()> { Ok(()) }' > src/lib.rs && \
-    cargo build --release --bin openhuman-core 2>/dev/null || true && \
+    cargo build --profile "${CARGO_PROFILE}" --bin openhuman-core 2>/dev/null || true && \
     rm -rf src
 
 # Copy actual source and build
 COPY src/ src/
 # Touch main.rs to force rebuild of our code (not deps)
 RUN touch src/main.rs src/lib.rs && \
-    cargo build --release --bin openhuman-core
+    cargo build --profile "${CARGO_PROFILE}" --bin openhuman-core && \
+    cp "target/${CARGO_PROFILE}/openhuman-core" /tmp/openhuman-core
 
 # ==========================================================================
 # Stage 2: Minimal runtime image
@@ -84,7 +91,7 @@ RUN mkdir -p /home/openhuman/.openhuman \
  && chown -R openhuman:openhuman /home/openhuman
 
 # Copy the built binary
-COPY --from=builder /build/target/release/openhuman-core /usr/local/bin/openhuman-core
+COPY --from=builder /tmp/openhuman-core /usr/local/bin/openhuman-core
 
 # Copy the entrypoint script that chowns the workspace volume before dropping
 # privileges.  The script is a separate file so the E2E entrypoint

gitbooks/features/cloud-deploy.md

@@ -649,6 +649,10 @@ To run the same check locally:
 ```bash
 docker build -t openhuman-core:smoke .
 
+# Optional: tune build profile and Cargo parallelism.
+# Keep CARGO_BUILD_JOBS=1 on constrained builders; raise it on larger machines.
+docker build --build-arg CARGO_PROFILE=release --build-arg CARGO_BUILD_JOBS=4 -t openhuman-core:release .
+
 # Token-set path (App Platform):
 docker run -d --name oh-smoke -p 7788:7788 \
   -e OPENHUMAN_CORE_TOKEN=smoke-test-token \