add a install xarray step to the upstream-dev CI (pydata#5044)

* install the checked-out xarray [test-upstream] [skip-ci]

* also uninstall any version of xarray [test-upstream] [skip-ci]

* fetch all tags and commits [test-upstream] [skip-ci]

.github/workflows/upstream-dev-ci.yaml

@@ -48,6 +48,8 @@ jobs:
       artifacts_availability: ${{ steps.status.outputs.ARTIFACTS_AVAILABLE }}
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 # Fetch all history for all branches and tags.
       - uses: conda-incubator/setup-miniconda@v2
         with:
           channels: conda-forge
@@ -60,6 +62,9 @@ jobs:
         run: |
           mamba env update -f ci/requirements/environment.yml
           bash ci/install-upstream-wheels.sh
+      - name: Install xarray
+        run: |
+          python -m pip install --no-deps -e .
       - name: Version info
         run: |
           conda info -a

ci/install-upstream-wheels.sh

@@ -15,7 +15,8 @@ conda uninstall -y --force \
     rasterio \
     pint \
     bottleneck \
-    sparse
+    sparse \
+    xarray
 # to limit the runtime of Upstream CI
 python -m pip install pytest-timeout
 python -m pip install \