Add gradle (6.9.1) agent

[yuezhuangshi]

fix #25

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[yuezhuangshi]

Hi @LinuxSuRen , Pipeline failed due to

#7 0.157 --2021-10-14 01:49:57--  https://mirrors.edge.kernel.org/pub/software/scm/git/git-2.9.5.tar.gz
#7 0.167 Resolving mirrors.edge.kernel.org (mirrors.edge.kernel.org)... 147.75.197.195, 2604:1380:1:3600::1
#7 0.172 Connecting to mirrors.edge.kernel.org (mirrors.edge.kernel.org)|147.75.197.195|:443... connected.
#7 0.198 ERROR: cannot verify mirrors.edge.kernel.org's certificate, issued by '/C=US/O=Let\'s Encrypt/CN=R3':
#7 0.198   Issued certificate has expired.
#7 0.198 To connect to mirrors.edge.kernel.org insecurely, use `--no-check-certificate'.

Should we add --no-check-certificate flag for git installtion? What do you think?

[LinuxSuRen]

Should we add --no-check-certificate flag for git installtion? What do you think?

I prefer to do not to ignore the potential security issues. It's better to find a way to fix it.

[yuezhuangshi]

Should we add --no-check-certificate flag for git installtion? What do you think?

I prefer to do not to ignore the potential security issues. It's better to find a way to fix it.

Maybe we should wait for the maintainer to update site certificate and try again

[LinuxSuRen]

Maybe we should wait for the maintainer to update site certificate and try again

This is also an option.