* feature: add agit flow support ref: https://git-repo.info/en/2020/03/agit-flow-and-git-repo/ example: ```Bash git checkout -b test echo "test" >> README.md git commit -m "test" git push origin HEAD:refs/for/master -o topic=test ``` Signed-off-by: a1012112796 <1012112796@qq.com> * fix lint * simplify code add fix some nits * update merge help message * Apply suggestions from code review. Thanks @jiangxin * add forced-update message * fix lint * splite writePktLine * add refs/for/<target-branch>/<topic-branch> support also * Add test code add fix api * fix lint * fix test * skip test if git version < 2.29 * try test with git 2.30.1 * fix permission check bug * fix some nit * logic implify and test code update * fix bug * apply suggestions from code review * prepare for merge Signed-off-by: Andrew Thornton <art27@cantab.net> * fix permission check bug - test code update - apply suggestions from code review @zeripath Signed-off-by: a1012112796 <1012112796@qq.com> * fix bug when target branch isn't exist * prevent some special push and fix some nits * fix lint * try splite * Apply suggestions from code review - fix permission check - handle user rename * fix version negotiation * remane * fix template * handle empty repo * ui: fix branch link under the title * fix nits Co-authored-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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