Add tests against Oscar master (#122)

.github/workflows/OscarTests.yml

@@ -0,0 +1,91 @@
+name: Run tests with Oscar master
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  # group by workflow and ref; the last slightly strange component ensures that for pull
+  # requests, we limit to 1 concurrent job, but for the master branch we don't
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref != 'refs/heads/master' || github.run_number }}
+  # Cancel intermediate builds, but only if it is a pull request build.
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  oscartest:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 120
+    continue-on-error: ${{ matrix.julia-version == 'nightly' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version:
+          - '1.6'
+          - '1.8'
+          - '1.9'
+          - 'nightly'
+        julia-arch:
+          - x64
+        os:
+          - ubuntu-latest
+        # include:
+          # Add a few macOS jobs (not too many, the number we can run in parallel is limited)
+          # - julia-version: '1.6'
+          #   julia-arch: x64
+          #   os: macOS-latest
+          # - julia-version: 'nightly'
+          #   julia-arch: x64
+          #   os: macOS-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # For Codecov, we must also fetch the parent of the HEAD commit to
+          # be able to properly deal with PRs / merges
+          fetch-depth: 2
+
+      - name: "Set up Julia"
+        uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
+
+      - name: Restore cache
+        uses: julia-actions/cache@v1
+        with:
+          cache-name: 'oscartest-${{ matrix.julia-version }}-${{ matrix.os }}-${{ matrix.julia-arch }}'
+
+      - name: "Clone Oscar.jl"
+        run: |
+          git clone --branch master-pbwdeformations https://github.com/lgoettgens/Oscar.jl oscar-dev/Oscar.jl
+          echo "Checking out Oscar.jl commit:"
+          git show --oneline -s
+
+      - name: "Dev Oscar.jl"
+        run: |
+          using Pkg
+          Pkg.develop(PackageSpec(path="oscar-dev/Oscar.jl"))
+        shell: julia --color=yes --project=. {0}
+
+      - name: "Build package"
+        uses: julia-actions/julia-buildpkg@latest
+
+      # - name: "limit OpenMP threads"
+      #   if: runner.os == 'macOS'
+      #   # restrict number of openMP threads on macOS due to oversubscription
+      #   run: echo "OMP_NUM_THREADS=1" >> $GITHUB_ENV
+
+      - name: "Run tests"
+        uses: julia-actions/julia-runtest@latest
+
+      - name: "Process code coverage"
+        uses: julia-actions/julia-processcoverage@v1
+
+      - name: "Upload coverage data to Codecov"
+        continue-on-error: true
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}