Add ".devspace/" entry into ".dockerignore" on "devspace init"

[epierotto]

What happened?
devspace init does not add .devspace/ entry into .dockerignore

What did you expect to happen instead?
I expect devspace to add .devspace/ entry into .dockerignore since it's not required during image build.

How can we reproduce the bug? (as minimally and precisely as possible)
Run devspace init in a folder with both .gitignore and .dockerignore files and check the entries added by devspace.

Local Environment:

• DevSpace Version: 5.9.1
• Operating System: mac (Not sure is relevant)
• Deployment method: N/A

Anything else we need to know?

/kind bug

[FabianKramm]

@epierotto thanks for creating this issue! Yes we should add this

[FabianKramm]

@epierotto this was added with v5.11.0