Make layout parameter available as a user property

[marcrohlfs]

We need to change the packaging layout in some special cases (in CI builds) and don't want to clutter or production code adding overwritable properties to our POMs - furthermore we'd have to define a default that would disable the standard behavior of layout auto-detection.

With this PR the layout parameter of the repackage goal can be set from the
command line, using the system property spring-boot.repackage.layout.

[snicoll]

) and don't want to clutter or production code adding overwritable properties to our POMs - furthermore we'd have to define a default that would disable the standard behavior of layout auto-detection.

@marcrohlfs regardless of the proposal here I'd like to understand what you mean by that. If you want to change the layout you can define a different plugin configuration in a profile and enable that profile on the command line with -P. What is wrong with that?

[marcrohlfs]

@snicoll Normally You're right, but in our setup (with multiple applications not "attached" to the same Maven parent), it's barely possible to define (a profile with) a common plugin management. Furthermore we're solving an internal case on public code/setup with this, hence we rather don't want to have this extra configuration in the public POM.

[snicoll]

Fair enough, thanks for the feedback @marcrohlfs

[snicoll]

@marcrohlfs thank you for making your first contribution to Spring Boot. This is now merged in master.

[marcrohlfs]

@snicoll You're welcome. And many thanks fo accepting and merging 👍