Add conda build / upload via gh action

.github/workflows/deploy.yml

@@ -0,0 +1,40 @@
+name: deploy
+
+on:
+  push:
+    tags:
+      - '1.*'
+
+jobs:
+  package:
+    strategy:
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      ANACONDA_API_TOKEN: ${{ secrets.ANACONDA_API_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          auto-activate-base: true
+          activate-environment: bld-env
+          environment-file: .github/workflows/etc/bld-environment.yml
+          condarc-file: .github/workflows/etc/.condarc
+          miniforge-variant: Miniforge3
+          use-mamba: true
+      - name: linux conda build
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash -l {0}
+        run: conda mambabuild -c conda-forge conda-recipe
+      - name: osx conda build
+        if: matrix.os == 'macos-latest'
+        shell: bash -l {0}
+        run:  conda mambabuild -c conda-forge conda-recipe
+      - name: windows conda build
+        if: matrix.os == 'windows-latest'
+        shell: cmd /C CALL {0}
+        run: conda mambabuild -c conda-forge conda-recipe

.github/workflows/etc/.condarc

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+anaconda_upload: True

.github/workflows/etc/bld-environment.yml

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+name: bld-env
+channels:
+  - conda-forge
+  - nodefaults
+dependencies:
+  - anaconda-client
+  - conda-build
+  - setuptools_scm
+  - boa