Build a conda package with pixi-build and publish it on release

.github/workflows/push_conda.yml

@@ -0,0 +1,53 @@
+name: Publish Conda package
+
+on:
+  release:
+    types: [published]
+
+  # build the package (without uploading) when the packaging changes
+  pull_request:
+    paths:
+      - pyproject.toml
+      - .github/workflows/push_conda.yml
+
+  workflow_dispatch:
+    inputs:
+      release_tag:
+        description: "Release tag to simulate, e.g. v1.4.0"
+        required: true
+        type: string
+
+      upload:
+        description: "Actually upload package"
+        required: true
+        default: false
+        type: boolean
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v6
+        with:
+          ref: >-
+            ${{ github.event_name == 'release'
+                && github.event.release.tag_name
+                || github.ref }}
+          fetch-depth: 0
+
+      - name: Build and publish
+        uses: khanlab/actions/.github/actions/action-pixi_task-publish@df4211abe672b61c81f4177eef5b9516edf2944e
+        with:
+          release-tag: >-
+            ${{ github.event_name == 'release'
+                && github.event.release.tag_name
+                || github.event_name == 'pull_request'
+                && format('v0.0.0.dev{0}', github.run_number)
+                || inputs.release_tag }}
+          channel: akhanf/khanlab
+          api-key: ${{ secrets.PREFIX_API_KEY }}
+          upload: >-
+            ${{ github.event_name == 'release'
+                || inputs.upload == true }}

.gitignore

@@ -37,3 +37,8 @@ tests/test_results/
 fireants/scripts/template/configs/test*.yaml
 fireants/**/*debug/
 **/.DS_Store
+
+# pixi
+.pixi/
+pixi.lock
+*.conda

pyproject.toml

@@ -27,3 +27,46 @@ exclude = ["docker*", "notepad*", "fused_ops*", "tutorials*"]
 
 [tool.hatch.build.targets.wheel]
 packages = ["fireants"]
+
+# ----------------------------------------------------------------------
+# Conda package, built with pixi-build and published to akhanf/khanlab on
+# release (.github/workflows/push_conda.yml). The run dependencies are listed
+# here rather than converted from [project.dependencies], to relax the
+# SimpleITK pin and leave out typing (stdlib) and pytest (tests only).
+# ----------------------------------------------------------------------
+
+[tool.pixi.workspace]
+channels = ["conda-forge"]
+platforms = ["linux-64"]
+preview = ["pixi-build"]
+
+[tool.pixi.package]
+name = "fireants"
+# set from the release tag by the publish workflow
+version = "0.0.0.dev0"
+publish = true
+
+[tool.pixi.package.build.backend]
+name = "pixi-build-python"
+version = "*"
+channels = ["conda-forge"]
+
+[tool.pixi.package.build.config]
+ignore-pyproject-manifest = true
+
+[tool.pixi.package.host-dependencies]
+hatchling = ">=1.21.0"
+
+[tool.pixi.package.run-dependencies]
+python = ">=3.9"
+pytorch = ">=2.3.0"
+# the PyPI SimpleITK==2.2.1 pin is not needed, and conflicts with newer packages
+simpleitk = ">=2.2.1"
+nibabel = "*"
+numpy = "*"
+scipy = "*"
+scikit-image = "*"
+matplotlib-base = "*"
+tqdm = "*"
+pandas = "*"
+hydra-core = "*"