update Dockerfile

[hurricane1988]

1. add -ldflags '-s -w' in Dockerfile
   remove the main.go in build

[CLAassistant]

All committers have signed the CLA.

[benjaminhuo]

@hurricane1988 Thanks for the contribution. Would you sign your commit like below?:

git commit -s --amend
git push -f

@wanjunlei @wrongerror @tpiperatgod , please help to review

[hurricane1988]

@wrongerror could you review my request?

[wrongerror]

Could you please describe the purpose of this PR? @hurricane1988

[benjaminhuo]

@hurricane1988 Thanks for the contribution. Would you sign your commit like below?:

git commit -s --amend
git push -f

@wanjunlei @wrongerror @tpiperatgod , please help to review

@hurricane1988 You need to sign your commit first. And then you'll need to examine why the E2E test failed with your PR?

[hurricane1988]

@hurricane1988 Thanks for the contribution. Would you sign your commit like below?:

git commit -s --amend
git push -f

@wanjunlei @wrongerror @tpiperatgod , please help to review

@hurricane1988 You need to sign your commit first. And then you'll need to examine why the E2E test failed with your PR?

OK, I will examine E2E test first.

[benjaminhuo]

@hurricane1988 Your commits look a bit messed up. You may need to rebase or squash your commit:

git remote add upstream https://github.com/OpenFunction/OpenFunction.git
git fetch --all
git checkout main
git rebase upstream/main
git commit -s --amend
git push -f

[benjaminhuo]

https://medium.com/@daviddavid533/cgo-enabled-0-and-installsuffix-cgo-are-no-longer-required-since-go-1-10-127d8c265cb1 according to this, -installsuffix cgo is no longer needed for go 1.10+

[hurricane1988]

Could you please describe the purpose of this PR? @hurricane1988
@wrongerror refer to https://go.dev/ref/mod, go mod tidy method "go mod tidy ensures that the go.mod file matches the source code in the module. It adds any missing module requirements necessary to build the current module’s packages and dependencies, and it removes requirements on modules that don’t provide any relevant packages", and go mod download method "The go mod download command downloads the named modules into the module cache.", I think we could speed up the building time with "go mod tidy" method.