Update Dockerfile.dev to install gnupg before calling apt-key del 7fa2af80 (fix: #2075)

[yeahdongcn]

Description

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Fixes #2075

Type of change

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• Bug fix (non-breaking change which fixes an issue)

Feature/Issue validation/testing

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• DOCKER_BUILDKIT=1 docker build -f Dockerfile.dev -t pytorch/torchserve-kfs:latest-dev . now can run without any error.
  Logs:

❯ DOCKER_BUILDKIT=1 docker build -f Dockerfile.dev -t pytorch/torchserve-kfs:latest-dev .
[+] Building 514.7s (14/17)                                                                                                                            
 => [compile-image 1/9] FROM docker.io/library/ubuntu:20.04@sha256:0e0402cd13f68137edb0266e1d2c682f217814420f2d43d300ed8f65479b14fb               0.0s
 => CACHED [compile-image 2/9] RUN cp /etc/apt/sources.list /etc/apt/sources.list.bak                                                             0.0s
 => CACHED [compile-image 3/9] RUN sed -i "s@\(archive\|security\|ports\).ubuntu.com@mirrors.tuna.tsinghua.edu.cn@g" /etc/apt/sources.list        0.0s
 => CACHED [compile-image 4/9] RUN --mount=type=cache,id=apt-dev,target=/var/cache/apt   apt-get update &&   DEBIAN_FRONTEND=noninteractive apt-  0.0s
 => CACHED [compile-image 5/9] RUN apt-key del 7fa2af80                                                                                           0.0s
 => CACHED [compile-image 6/9] RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.  0.0s
 => CACHED [compile-image 7/9] RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu2004/x86_  0.0s
 => CACHED [compile-image 8/9] RUN --mount=type=cache,id=apt-dev,target=/var/cache/apt   DEBIAN_FRONTEND=noninteractive apt-get install --no-ins  0.0s
 => CACHED [compile-image 9/9] RUN python -m pip install -U pip setuptools    

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[mreso]

LGTM

[codecov]

Codecov Report

Merging #2076 (d68b57b) into master (eced76d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2076   +/-   ##
=======================================
  Coverage   53.38%   53.38%           
=======================================
  Files          71       71           
  Lines        3224     3224           
  Branches       56       56           
=======================================
  Hits         1721     1721           
  Misses       1503     1503           

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