Add workflow running conda build

This change adds a GitHub action that builds the benchcab package via
the `conda build` command. This verifies we can still build the package
in case we make changes to .conda/meta.yaml.

Fixes #173

.github/workflows/ci.yaml

@@ -28,4 +28,20 @@ jobs:
         uses: codecov/codecov-action@v3
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-          files: ./coverage.xml
+          files: ./coverage.xml
+
+  build_conda_package:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: '3.9'
+      - name: Test conda build
+        run: |
+          conda install conda-build
+          conda build -c conda-forge .