Use conda-presto in GitHub Actions#

Configure the repository variable CONDA_PRESTO_URL with your service’s HTTPS base URL. The Action sends environment files and channel settings to that service.

The example targets current main. Pin a reviewed commit for a production workflow.

name: Resolve environment

on:
  pull_request:
    paths:
      - environment.yml

jobs:
  lock:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: jezdez/conda-presto@main
        id: solve
        with:
          endpoint: ${{ vars.CONDA_PRESTO_URL }}
          file: environment.yml
          platforms: linux-64,osx-arm64
          format: rattler-lock-v6
          output: pixi.lock

      - uses: actions/upload-artifact@v4
        if: steps.solve.outputs.solved == 'true'
        with:
          name: pixi-lock
          path: pixi.lock

For inline input, replace file with specs: python=3.13,numpy. Values in specs, channels, environments and platforms are comma-separated without surrounding spaces. Omitted channels use the input file or service defaults.

For the workspace manifest in Parse and solve a workspace manifest, select named environments and request a combined lock:

- uses: jezdez/conda-presto@main
  id: workspace
  with:
    endpoint: ${{ vars.CONDA_PRESTO_URL }}
    file: conda.toml
    environments: default,test
    platforms: linux-64,osx-arm64
    format: conda-workspaces-lock-v1
    output: conda.lock

- uses: actions/upload-artifact@v4
  if: steps.workspace.outputs.solved == 'true'
  with:
    name: conda-lock
    path: conda.lock

A complete workspace workflow and its manifest are available in the repository. The hosted Action smoke test uses that same manifest.

The lock contains all four selected solutions. Omit environments and platforms to solve every declared environment and target. Workspace requests use manifest channels and do not accept additional specs or channels.

GitHub-hosted Ubuntu runners provide the required curl and jq tools. Plain HTTP is accepted only for loopback servers. The Action validates HTTP success and native platform errors, and leaves response bodies out of logs. Use the output file for large results and the bounded result output for small responses.

See GitHub Action reference for the input and failure behavior, and Output formats to select a format.

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