Update CI to latest practices and fix broken test

.github/workflows/ci.yml

@@ -1,4 +1,7 @@
 name: CI
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 on:
   push:
     branches: [master]
@@ -35,17 +38,10 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/cache@v1
       - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
       - run: echo "LD_LIBRARY_PATH=$(R RHOME)/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
         if: matrix.os == 'ubuntu-latest'
       - uses: julia-actions/julia-buildpkg@v1

.github/workflows/docs.yml

@@ -1,5 +1,7 @@
 name: Documentation
-
+concurrency:
+  group: docs-${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 on:
   push:
     branches:
@@ -12,13 +14,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: r-lib/actions/setup-r@v1
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
       - run: echo "LD_LIBRARY_PATH=$(R RHOME)/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
-      - uses: julia-actions/julia-buildpkg@latest
-      - name: Install dependencies
-        run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
-      - name: Make docs
-        run: julia --project=docs/ docs/make.jl
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-docdeploy@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCUMENTER_KEY: ${{ secrets.SSH_KEY }}

test/runtests.jl

@@ -1,6 +1,10 @@
 using RCall
 using Test
 
+# before RCall does anything
+const R_PPSTACKTOP_INITIAL = unsafe_load(cglobal((:R_PPStackTop, RCall.libR), Int))
+@info "" R_PPSTACKTOP_INITIAL
+
 hd = homedir()
 
 if Sys.iswindows()
@@ -61,8 +65,5 @@ end
 
 @info "" RCall.conda_provided_r
 
-if !Sys.iswindows() # https://github.com/JuliaInterop/RCall.jl/pull/462
-    if !RCall.conda_provided_r # this test will fail for the Conda-provided R
-        @test unsafe_load(cglobal((:R_PPStackTop, RCall.libR), Int)) == 0
-    end
-end
+# make sure we're back where we started
+@test unsafe_load(cglobal((:R_PPStackTop, RCall.libR), Int)) == R_PPSTACKTOP_INITIAL