[Do Not Merge] Run Julia Base Tests

This is just to see what the current state here is, since I didn't feel
like running this on my Laptop.

.github/workflows/BaseTests.yml

@@ -0,0 +1,38 @@
+name: Run Julia Base Tests
+on:
+  pull_request:
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - 'nightly'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+    env:
+      PYTHON: ""
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        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/julia-buildpkg@v1
+      - name: Test Julia Base
+        run: |
+          julia --project test/juliatests.jl