Better Bitbucket support for gitversion /output buildserver for Powershell

[arihannu]

Is your improvement request related to a problem? Please describe.
We are using GitVersion in Windows environment, in Bitbucket Pipelines runner. The problem is that the gitversion /output buildserver output file gitversion.properties is in bash format, and since Windows Bitbucket Pipelines runner runs using Powershell, it is more difficult to "source" the variables from that file.

Detailed Description

gitversion /output buildserver, when run in Bitbucket Pipelines (Windows) Powershell runner, should output, not gitversion.properties for bash, but instead for Powershell, maybe it'll be then a .ps1 file, that Powershell can then "source".
Currently, we are reading gitversion.properties file, regex'n the export lines and then reading the key/value pair to a Powershell variable. This is cumbersome.

Possible Implementation

https://github.com/GitTools/GitVersion/blob/c704b65c52e3abfc2e2aabec900781e7a2218b15/src/GitVersion.BuildAgents/Agents/BitBucketPipelines.cs#L39C25-L39C25

Here "export" is added for each key/value pair line, since it's only meant for bash.

Output also a file that can be "sourced" in Powershell (I think in Powershell, it's just a "dot" (.) operation).

[asbjornu]

If you're able to implement this in a way that is also compatible with Bash, it will be merged for sure! 👍🏼

[arturcic]

Closed by #3833

[arturcic]

🎉 This issue has been resolved in version 6.0.0-beta.5 🎉
The release is available on:

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