fix(docker): add libgcc to Alpine runtime for Rust volume server (#8883)

The Rust weed-volume binary requires libgcc_s.so.1 for stack unwinding
(_Unwind_* symbols). Without it, the binary fails to load in the Alpine
container with "Error loading shared library libgcc_s.so.1".

docker/Dockerfile.go_build

@@ -51,7 +51,7 @@ COPY --from=builder /go/src/github.com/seaweedfs/seaweedfs/docker/entrypoint.sh
 
 # Install dependencies and create non-root user
 RUN apk upgrade --no-cache zlib && \
-    apk add --no-cache fuse curl su-exec && \
+    apk add --no-cache fuse curl su-exec libgcc && \
     addgroup -g 1000 seaweed && \
     adduser -D -u 1000 -G seaweed seaweed