Simplify renv system dependencies based on pkgdepends as our prefer…

…red choice

.github/workflows/ci-cd-renv.yml

@@ -53,20 +53,15 @@ jobs:
 
       - name: Install system dependencies
         # This is not taken care of (yet) by r-lib/actions/setup-renv
-        # We rely on pkgdepends (from the library embedded in pak) to detect and
-        # install system requirements for the renv.lock packages
-        # We could use pak-based installation for renv, which includes system
-        # requirements, but would have to handle the pak cache explicitly
         # See https://github.com/r-lib/actions/issues/785
         run: |
+          # We rely on pkgdepends from the library embedded in pak
           install.packages("pak", repos = "https://r-lib.github.io/p/pak/stable/")
           install.packages("jsonlite")
           .libPaths(c(system.file("library", package = "pak"), .libPaths()))
-          pkg_installation_proposal <- pkgdepends::new_pkg_installation_proposal(
+          pkgdepends::new_pkg_installation_proposal(
             names(jsonlite::read_json("renv.lock")$Packages), config = list(dependencies = FALSE)
-          )$solve()
-          pkg_installation_proposal$show_solution()
-          pkg_installation_proposal$install_sysreqs()
+          )$solve()$install_sysreqs()
         shell: Rscript {0}
 
       - name: Activate renv and restore packages with cache