The Microsoft development ecosystem uses msbuild as its build/deployment mechanism yet the SQL Server team's support is sadly lacking.
The engine team have gone a long way to supporting msbuild through the provision of .dacpacs & SSDT database projects yet the SSIS/SSAS/SSRS teams are still lagging way behind. The teams that I work on embrace msbuild and Continuous Integration as a way to deploy their projects but getting these BI components work in the same way is very very hard.
Can I also suggest that you adopt the .dacpac/.ispac approach of the DB/SSIS teams respectively by providing a (say) .rspac file as a means for distributing the definition of a SSRS solution.
I have provided similar requests for SSAS & SSIS: