Start building and publishing conda nightlies

.github/workflows/conda.yml

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+name: Conda build
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+  pull_request:
+    paths:
+      - setup.py
+      - ci/recipe/**
+      - .github/workflows/conda.yml
+      - pyproject.toml
+
+# When this workflow is queued, automatically cancel any previous running
+# or pending jobs from the same branch
+concurrency:
+  group: conda-${{ github.ref }}
+  cancel-in-progress: true
+
+# Required shell entrypoint to have properly activated conda environments
+defaults:
+  run:
+    shell: bash -l {0}
+
+jobs:
+  conda:
+    name: Build (and upload)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4.1.1
+        with:
+          fetch-depth: 0
+      - name: Set up Python
+        uses: conda-incubator/setup-miniconda@v3.0.3
+        with:
+          miniforge-variant: Mambaforge
+          use-mamba: true
+          python-version: 3.9
+          channel-priority: strict
+      - name: Install dependencies
+        run: |
+          mamba install -c conda-forge boa conda-verify
+
+          which python
+          pip list
+          mamba list
+      - name: Build conda packages
+        run: |
+          # suffix for pre-release package versions
+          export VERSION_SUFFIX=a`date +%y%m%d`
+
+          # conda search for the latest dask-core pre-release
+          arr=($(conda search --override-channels -c dask/label/dev dask-core | tail -n 1))
+
+          # extract dask-core pre-release version / build
+          export DASK_CORE_VERSION=${arr[1]}
+
+          # distributed pre-release build
+          conda mambabuild ci/recipe \
+                           --channel dask/label/dev \
+                           --no-anaconda-upload \
+                           --output-folder .
+      - name: Upload conda packages
+        if: github.event_name == 'push' && github.repository == 'dask/dask-expr'
+        env:
+          ANACONDA_API_TOKEN: ${{ secrets.DASK_CONDA_TOKEN }}
+        run: |
+          # install anaconda for upload
+          mamba install -c conda-forge anaconda-client
+
+          anaconda upload --label dev noarch/*.tar.bz2

ci/recipe/meta.yaml

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+{% set major_minor_patch = environ.get('GIT_DESCRIBE_TAG', '0.0.0.dev').lstrip('v').split('.') %}
+{% set new_patch = major_minor_patch[2] | int + 1 %}
+{% set version = (major_minor_patch[:2] + [new_patch]) | join('.') + environ.get('VERSION_SUFFIX', '') %}
+{% set dask_version = environ.get('DASK_CORE_VERSION', '0.0.0.dev') %}
+
+
+package:
+  name: dask-expr
+  version: {{ version }}
+
+source:
+  git_url: ../..
+
+build:
+  number: {{ GIT_DESCRIBE_NUMBER }}
+  noarch: python
+  string: py_{{ GIT_DESCRIBE_HASH }}_{{ GIT_DESCRIBE_NUMBER }}
+  script: {{ PYTHON }} -m pip install . -vv
+
+requirements:
+  host:
+    - python >=3.9
+    - pip
+    - dask-core {{ dask_version }}
+    - versioneer =0.28
+    - tomli
+  run:
+    - python >=3.9
+    - {{ pin_compatible('dask-core', max_pin='x.x.x.x') }}
+    - pyarrow
+    - pandas >=2
+
+test:
+  imports:
+    - dask_expr
+  requires:
+    - pip
+  commands:
+    - pip check
+
+about:
+  home: https://github.com/dask/dask-expr
+  summary: 'High Level Expressions for Dask'
+  description: |
+    High Level Expressions for Dask
+  license: BSD-3-Clause
+  license_family: BSD
+  license_file: LICENSE.txt
+  doc_url: https://github.com/dask/dask-expr/blob/main/README.md
+  dev_url: https://github.com/dask/dask-expr