Added CHANGELOG note on updated dependencies.

chore: Updated coverage badge.

Updated CHANGELOG with v0.15.0

Merge branch 'main' of github.com:gomlx/gomlx

Merge branch 'main' of github.com:gomlx/gomlx

Split Dockerfile into two targets.

Merge pull request gomlx#65 from gomlx/gpumem

Improved accelerator memory  usage

Updated gopjrt dependency.

Updated dependency to gopjrt v0.3.2

Changed gomlx branch to main in Dockerfile.