add nightly tests

Author: Christopher Doris

.github/workflows/tests-nightly.yml

@@ -0,0 +1,43 @@
+name: Tests (nightly)
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+    tags: '*'
+
+jobs:
+  tests:
+    name: Test (${{ matrix.os }}-${{ matrix.arch }}, julia ${{ matrix.jlversion }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        arch: [x64] # x86 unsupported by MicroMamba
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        jlversion: ['nightly']
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.jlversion }}
+          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
+      - uses: julia-actions/julia-runtest@v1
+        env:
+          JULIA_DEBUG: PythonCall
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info