fix: separate cat command into its own RUN instruction in Dockerfile

feat: attach labtaxa metadata to SoilProfileCollection objects

fix: improve Docker metadata and exclude build files from R CMD CHECK

refactor: extract morphologic database download into separate function

fix: ensure morphologic database downloads even when LDM is cached

build: re-arranging

build: explicitly set cache dir for consistency

build: add Makefile and build script

build: improve cache and RDS messaging

fix: use installed extdata path location

docs: streamline release notes

fix: morphologic file path

build: add BUILD_DATE handling for better caching

build: better handling of part files

build: better handling of part files