Better comment in case of backport failure

[oliverpool]

Suggested in go-gitea/gitea#24470 (comment)

Instead of the current message

gitea-backporter/src/backport.ts

Line 51 in 1437aad

`I was unable to create a backport for ${giteaVersion.majorMinorVersion}. @${originalPr.user.login}, please send one manually. :tea:`,

The bot could point to the contrib/backport tool (untested):

`I was unable to create a backport for ${giteaVersion.majorMinorVersion}. @${originalPr.user.login}, please send one manually. :tea:

\`\`\`
go run ./contrib/backport ${originalPr.number}
...  // fix git conflicts if any
go run ./contrib/backport --continue
\`\`\`
`

[yardenshoham]

@zeripath would this suggestion be correct?

[silverwind]

I haven't personally used that script, so I can't speak for it, but I guess I will try next time.

[zeripath]

I think it might be helpful to add the --version option to the first command but that is the intended use of the --continue option

[oliverpool]

Note: by untested, I meant that I didn't test the typescript code. Regarding the 2 bash commands, I actually used them for the mentioned PR (with the --no-push flag, since I prefer manually pushing)

[zeripath]

Glad it works for you @oliverpool nice to know that I've done it right

[yardenshoham]

PRs for this would be accepted