[fix] dockerfile build error caused by trailing backslach

[hanzitong]

This PR fixes a typo in the Dockerfile.
The extra trailing backslash caused docker compose build errors.

[hanzitong]

For reference, the error log from docker compose build is shown below.

MY_PC:~/DLO_MultiView_Tracking/docker$ docker compose -f docker-compose-gui.yml build
WARN[0000] /home/nachi/DLO_MultiView_Tracking/docker/docker-compose-gui.yml: the attribute version is obsolete, it will be ignored, please remove it to avoid potential confusion
[+] Building 524.0s (15/15) FINISHED
=> [internal] load local bake definitions 0.0s
=> => reading from stdin 570B 0.0s
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 1.45kB 0.0s
=> WARN: NoEmptyContinuation: Empty continuation line (line 58) 0.0s
=> [internal] load metadata for docker.io/library/ros:humble-perception 1.9s
=> [auth] library/ros:pull token for registry-1.docker.io 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [ 1/10] FROM docker.io/library/ros:humble-perception@sha256:36f93aeb176121a456dc52cd9f98de940b5d1f7fd73730666cc65208332110ed 0.0s
=> CACHED [ 2/10] WORKDIR /ros2_ws 0.0s
=> CACHED [ 3/10] RUN apt-get update && apt-get install -y build-essential cmake git-all software-properties-common && rm -rf /var/lib/apt/lists/* 0.0s
=> CACHED [ 4/10] RUN apt-get update && apt-get install -y ros-humble-librealsense2* ros-humble-realsense2-* ros-humble-pcl-ros ros-humble-vision-msgs 0.0s
=> CACHED [ 5/10] RUN apt-get update && apt-get install -y ros-humble-rviz2 && rm -rf /var/lib/apt/lists/* 0.0s
=> CACHED [ 6/10] RUN apt-get update && apt-get install terminator wget -y 0.0s
=> CACHED [ 7/10] RUN wget -qO- https://docs.luxonis.com/install_dependencies.sh | bash 0.0s
=> CACHED [ 8/10] RUN sudo apt install -y ros-humble-depthai-ros 0.0s
=> CACHED [ 9/10] RUN . /opt/ros/humble/setup.bash 0.0s
=> ERROR [10/10] RUN pip install pyelastica colorama arrow torch==2.5 depthai pymeshfix trimesh mesh_to_sdf RUN pip ins 521.9s

[10/10] RUN pip install pyelastica colorama arrow torch==2.5 depthai pymeshfix trimesh mesh_to_sdf RUN pip install torch_geometric==2.6.1 torch-cluster==1.6.3:
0.886 Collecting pyelastica
1.212 Downloading pyelastica-0.3.3.post2-py3-none-any.whl (139 kB)
1.353 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 140.0/140.0 KB 993.8 kB/s eta 0:00:00
1.438 Collecting colorama
1.499 Downloading colorama-0.4.6-py2.py3-none-any.whl (25 kB)
1.617 Collecting arrow
1.667 Downloading arrow-1.4.0-py3-none-any.whl (68 kB)
1.735 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 68.8/68.8 KB 977.1 kB/s eta 0:00:00
1.997 Collecting torch==2.5
2.057 Downloading torch-2.5.0-cp310-cp310-manylinux1_x86_64.whl (906.4 MB)
475.9 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 906.4/906.4 MB 1.7 MB/s eta 0:00:00
476.9 Collecting depthai
477.0 Downloading depthai-3.3.0-cp39.cp310.cp311.cp312.cp313.cp314-cp39.cp310.cp311.cp312.cp313.cp314-manylinux_2_28_x86_64.whl (79.2 MB)
519.5 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 79.2/79.2 MB 1.9 MB/s eta 0:00:00
519.7 Collecting pymeshfix
519.7 Downloading pymeshfix-0.18.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl (1.4 MB)
520.3 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.4/1.4 MB 2.4 MB/s eta 0:00:00
520.7 Collecting trimesh
520.7 Downloading trimesh-4.11.1-py3-none-any.whl (740 kB)
521.1 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 740.4/740.4 KB 2.1 MB/s eta 0:00:00
521.3 Collecting mesh_to_sdf
521.4 Downloading mesh_to_sdf-0.0.15-py3-none-any.whl (14 kB)
521.6 Collecting RUN
521.7 Downloading run-0.3-py3-none-any.whl (5.1 kB)
521.7 Requirement already satisfied: pip in /usr/lib/python3/dist-packages (22.0.2)
521.7 ERROR: Could not find a version that satisfies the requirement install (from versions: none)
521.7 ERROR: No matching distribution found for install

---

Dockerfile:46

---

45 |

46 | >>> RUN pip install \

47 | >>> pyelastica \

48 | >>> colorama \

49 | >>> arrow \

50 | >>> torch==2.5 \

51 | >>> depthai \

52 | >>> pymeshfix \

53 | >>> trimesh \

54 | >>> mesh_to_sdf \

55 | >>>

56 | >>> RUN pip install \

57 | >>> torch_geometric==2.6.1 \

58 | >>> torch-cluster==1.6.3

59 |

---

failed to solve: process "/bin/bash -c pip install pyelastica colorama arrow torch==2.5 depthai pymeshfix trimesh mesh_to_sdf RUN pip install torch_geometric==2.6.1 torch-cluster==1.6.3" did not complete successfully: exit code: 1