Fix CI (#153)

* fix ci

* fix miniconda path

* test caching

* fix github output

* bump to cache@v3

* add restore key

* test caching

* remove restore keys

* debug variables

* fix ls -l

* print miniconda path

* bump

* try with env

* try alternative path

* yet another ettempt

* yet another attempt

* bump

* test caching

* do not cache on windows and mac os x

.github/workflows/R-CMD-check.yaml

@@ -48,14 +48,19 @@ jobs:
           needs: check
 
       - name: Cache miniconda
-        uses: actions/cache@v2
+        uses: actions/cache@v3
+        if: runner.os == 'Linux'
+        # no need to cache on macOS or Windows, since it takes longer to unpack
+        # the cache than to install miniconda and dependencies
         with:
-          path: "~/.local/share/r-miniconda"
-          key: ${{ runner.os }}-r${{ matrix.config.r }}-reticulate-miniconda
+          path: ~/.local/share/r-miniconda
+          key: ${{ runner.os }}-v${{ matrix.config.r }}-reticulate-miniconda
 
       - name: Install Python dependencies for reticulate
         run: |
-          reticulate::install_miniconda()
+          if (!reticulate:::miniconda_exists()) {
+            reticulate::install_miniconda()
+          }
           reticulate::py_install(c("anndata", "scanpy"), pip = TRUE)
         shell: Rscript {0}