Spack recipe for new release

[mrfh92]

[github-actions]

Branch features/1970-Spack_recipe_for_new_release created!

[LeonKaem]

initial configuration for heat 1.6 done, currently testing the package on juwel booster to get an idea if it is working properly

current working repository for updating the heat package:
https://github.com/LeonKaem/spack-packages/tree/update-heat-package

[LeonKaem]

spack installation of heat 1.6 with cuda enabled was successfull on juwel-booster, confirmed with small test-script

[ClaudiaComito]

Update:

spack/spack-packages#2741

[LeonKaem]

the update to the spack heat package got merged into spack-packages develop branch