Fix: Use setup-r-dependencies action to install system dependencies

- Replace manual dependency installation with r-lib/actions/setup-r-dependencies@v2
- Automatically installs system dependencies like libudunits2 for units package
- Fixes 'libudunits2.so.0: cannot open shared object file' error
- Uses pak for fast, reliable package installation
- Includes sessioninfo for debugging

Author: Robinlovelace

.github/workflows/publish.yml

@@ -34,10 +34,9 @@ jobs:
           use-public-rspm: true
 
       - name: Install R dependencies
-        run: |
-          install.packages("remotes")
-          remotes::install_local(".")
-        shell: Rscript {0}
+        uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          packages: deps::., any::sessioninfo
 
       - name: Set up Quarto
         uses: quarto-dev/quarto-actions/setup@v2