Update go module path for major version 2

[runephilosof-karnovgroup]

Component

other

Describe the bug

Getting versiogo.woodpecker-ci.org/woodpecker/v2n 2.0.0 of the go library results in an error

runephilosof@fedora:~/code/platform-woodpecker/woodpecker-repo-configurator (master)$ go get go.woodpecker-ci.org/woodpecker@v2.0.0
go: go.woodpecker-ci.org/woodpecker@v2.0.0: invalid version: module contains a go.mod file, so module path must match major version ("go.woodpecker-ci.org/woodpecker/v2")

System Info

go version go1.20.11 linux/amd64

Additional context

No response

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Checked that the bug isn't fixed in the next version already [https://woodpecker-ci.org/faq#which-version-of-woodpecker-should-i-use]
• Check that this is a concrete bug. For Q&A join our Discord Chat Server or the Matrix room.

[anbraten]

That's pretty annoying that we have to update the import paths of the whole codebase each time we release a major version 🙈 However I guess we need to change it then and release 2.1.0 to fix it.

[runephilosof-karnovgroup]

I guess the versioning of the go library and other go code can be separated somehow.
That would lower the amount of files that need to change.
The server go code is not a library, so it should not need to be versioned this way.
Avoiding "go.woodpecker-ci.org/woodpecker/v2/server" would be nice.

[qwerty287]

Maybe we should move the woodpecker-go SDK to its own repo? But for now, I'd merge the PR and do this afterwards.