Revert unneeded Github Actions changes

.github/workflows/julia-test-with-style.yml

@@ -33,9 +33,9 @@ jobs:
           make -j2
           LIBCEED_LIB=$(find $PWD/lib -name "libceed.*")
           pushd julia/LibCEED.jl
-          echo >> Project.toml
-          echo "[preferences.libCEED_jll]" >> Project.toml
-          echo "libceed_path = \"$LIBCEED_LIB\"" >> Project.toml
+          echo >> test/Project.toml
+          echo "[preferences.libCEED_jll]" >> test/Project.toml
+          echo "libceed_path = \"$LIBCEED_LIB\"" >> test/Project.toml
           [[ "$GITHUB_REF" =~ ^refs/(heads/release|tags/).* ]] || julia --project -e 'import Pkg; Pkg.test("LibCEED"; coverage=true, test_args=["--run-dev-tests"])'
-          git checkout Project.toml && julia --project -e 'import Pkg; Pkg.test("LibCEED")'
+          git checkout test/Project.toml && julia --project -e 'import Pkg; Pkg.test("LibCEED")'
           julia --project=.style/ -e 'import Pkg; Pkg.instantiate()' && julia --project=.style/ .style/ceed_style.jl && git diff --exit-code src test examples

julia/LibCEED.jl/test/Project.toml

@@ -0,0 +1,11 @@
+# A bug in Julia 1.6.0's Pkg causes Preferences to be dropped during `Pkg.test()`, so we work around
+# it by explicitly creating a `test/Project.toml` which will correctly communicate any preferences
+# through to the child Julia process.  X-ref: https://github.com/JuliaLang/Pkg.jl/issues/2500
+# See also test/Project.toml in FFTW.jl.
+
+[deps]
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Preferences = "21216c6a-2e73-6563-6e65-726566657250"
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+libCEED_jll = "762fde13-7596-547b-826d-8223c52d51c1"