[ISSUE]: dotnet-gitversion fails using 6.0.0-beta.6 in mainline mode

[DSpirit]

Prerequisites

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• I have searched issues to ensure it has not already been reported

GitVersion package

GitVersion.Tool

GitVersion version

6.0.0-beta.6

Operating system

Linux, Windows

What are you seeing?

Could not build the configuration instance because following exception occurred: 'Requested value 'Mainline' was not found.' Please ensure that the /overrideconfig parameters are correct and the configuration file is in the correct format.

What is expected?

Previous builds on 6.0.0-beta.5 had no issues and something like:
Begin: Getting tagged semantic versions of mainline branches. Format: Strict...

Steps to Reproduce

dotnet tool update --global GitVersion.Tool --prerelease
dotnet-gitversion /config .\GitVersion.v6.yml

using this config:

mode: Mainline
update-build-number: false
branches:
  main:
    regex: ^master$|^main$
  feature:
    regex:  ^feature(s)?[/-]
    label: 'beta'
    increment: minor
    mode: ContinuousDeployment
  hotfix:
    regex: ^(hot|bug)?fix(es)?[/-]
    label: 'beta'
    increment: Patch
    mode: ContinuousDeployment
  release:
    regex: ^releases?[/-]
    label: rc
    mode: ContinuousDeployment
  pull-request:
    regex: ^(pull|pull\-requests|pr)[/-]
    label: alpha
  dependabot:
    mode: ContinuousDelivery
    regex:  ^dependabot?[/-]
    source-branches: ['feature','main','hotfix','dependabot']
    label: 'alpha'
    increment: Patch
ignore:
  sha: []

RepositoryFixture Test

No response

Output log or link to your CI build (if appropriate).

No response

[arturcic]

@HHobeck can you check this one?

[HHobeck]

The Mainline mode is deprecated and has been removed in version 6.0.0-beta.6.

In the breaking change documentation you will find the following:

The Mainline mode and the related implementation has been removed completely. The new TrunkBased version strategy should be used instead.

Please use the trunk based workflow instead.

See https://github.com/GitTools/GitVersion/blob/main/docs/input/docs/reference/configuration.md

[vRune4]

I optimistically tried simply changing mode:

merge-message-formats: {}
update-build-number: true
semantic-version-format: Strict
branches: {}
ignore:
  sha: []
mode: TrunkBased/v1
increment: None
source-branches: []
is-source-branch-for: []

That did not work. Then I tried to run init which threw an exception.

Could someone please drop a hint what a simple GitVersion.yml looks like with TrunkBased activated.

[arturcic]

@HHobeck can you have a look?

[HHobeck]

You can find all infomation in the configuration.md document. Please read it carefully and try the following configuration:

workflow: TrunkBased/v1

The init wizard was removed like mentioned in the breaking change documentation.

https://github.com/GitTools/GitVersion/blob/main/BREAKING_CHANGES.md