docker: ship the Rust maintenance worker in the image

Lance table buckets need a worker that can read the format, and until now the
only way to get one was a Rust toolchain and a cargo build. It now sits at
/usr/bin/weed-worker beside the Rust volume server, reached as
`docker run chrislusf/seaweedfs worker-rust --admin host:23646` — the verb
mirrors volume-rust, so plain `worker` still runs the Go one.

Taken pre-built or not at all: the lance jobs pull in arrow and datafusion, far
too large a tree to compile inside the image build, so an architecture CI did
not build for gets the empty placeholder the entrypoint refuses to exec, the
way the Rust volume server already does.

Claude-Session: https://claude.ai/code/session_01Rkp1Mw5E89Jp6dzJFYiMrm

docker/Dockerfile.go_build

@@ -29,6 +29,7 @@ FROM alpine:3.23 as rust_builder
 ARG TARGETARCH
 ARG TAGS
 COPY weed-volume-prebuilt/ /prebuilt/
+COPY weed-worker-prebuilt/ /prebuilt-worker/
 COPY --from=builder /go/src/github.com/seaweedfs/seaweedfs/seaweed-volume /build/seaweed-volume
 COPY --from=builder /go/src/github.com/seaweedfs/seaweedfs/weed /build/weed
 WORKDIR /build/seaweed-volume
@@ -47,16 +48,30 @@ RUN if [ -f "/prebuilt/weed-volume-${TARGETARCH}" ]; then \
       echo "Skipping Rust build for $TARGETARCH (unsupported)" && \
       touch /weed-volume; \
     fi
+# The Rust maintenance worker is taken pre-built or not at all: the lance jobs
+# it carries pull in arrow and datafusion, a far larger dependency tree than
+# the image build can carry, so an architecture CI did not build for gets the
+# same empty placeholder the entrypoint refuses to exec.
+RUN if [ -f "/prebuilt-worker/weed-worker-${TARGETARCH}" ]; then \
+      echo "Using pre-built Rust worker for ${TARGETARCH}" && \
+      cp "/prebuilt-worker/weed-worker-${TARGETARCH}" /weed-worker; \
+    else \
+      echo "No pre-built Rust worker for ${TARGETARCH}" && \
+      touch /weed-worker; \
+    fi
+
 # Pre-built binaries arrive via GitHub Actions artifacts, which drop the
 # executable bit, so the copied file is 0644 and exec fails with "Permission
-# denied". Restore it (no-op for the empty placeholder, which stays size 0).
-RUN chmod 0755 /weed-volume
+# denied". Restore it (no-op for the empty placeholders, which stay size 0).
+RUN chmod 0755 /weed-volume /weed-worker
 
 FROM alpine AS final
 LABEL author="Chris Lu"
 COPY --from=builder /go/bin/weed /usr/bin/
 # Copy Rust volume server binary (real binary on amd64/arm64, empty placeholder on other platforms)
 COPY --from=rust_builder /weed-volume /usr/bin/weed-volume
+# Same for the Rust maintenance worker, which serves Lance table buckets
+COPY --from=rust_builder /weed-worker /usr/bin/weed-worker
 RUN mkdir -p /etc/seaweedfs
 COPY --from=builder /go/src/github.com/seaweedfs/seaweedfs/docker/filer.toml /etc/seaweedfs/filer.toml
 COPY --from=builder /go/src/github.com/seaweedfs/seaweedfs/docker/entrypoint.sh /entrypoint.sh

docker/entrypoint.sh

@@ -90,6 +90,16 @@ case "$1" in
   	exec /usr/bin/weed-volume $ARGS $@
 	;;
 
+  'worker-rust')
+  	shift
+  	if [ ! -s /usr/bin/weed-worker ]; then
+  	  echo "Error: Rust maintenance worker is not available on this platform ($(uname -m))." >&2
+  	  echo "Use 'worker' for the Go maintenance worker instead." >&2
+  	  exit 1
+  	fi
+  	exec /usr/bin/weed-worker $@
+	;;
+
   'server')
   	ARGS="-dir=/data -volume.max=0 -master.volumeSizeLimitMB=1024"
   	if isArgPassed "-volume.max" "$@"; then