ci: based on github actions

Merge pull request go-git#1203 from sapk-fork/fix-int64

worktree: force convert to int64 to support 32bit os. Fix go-git#1202

Merge pull request go-git#1200 from src-d/go-mod

*: go module update

Merge pull request go-git#1142 from EmrysMyrddin/feature/export-new-r…

…emote

git : allows to create a Remote without a Repository

plumbing: commit.StatsContext and fix for orphan commit (go-git#1115)

plumbing: commit.StatsContext and fix for root commit

Merge pull request go-git#1065 from vmarkovtsev/fix-unicode

Remove Unicode normalization in difftree

Merge pull request go-git#1056 from jfontan/fix/lose-objects-shared-c…

…ache

storage/filesystem: check file object before using cache

Merge pull request go-git#1045 from kuba--/enh-1024/log-all

Implement git log --all

Merge pull request go-git#1028 from smola/clone-regression

repository: fix plain clone error handling regression

Merge pull request go-git#1025 from mcuadros/eoie

plumbing: format/index: support for EOIE extension