azure pipelines -> github actions

.github/actions/pre-test/action.yml

@@ -0,0 +1,41 @@
+inputs:
+  env:
+    default: ${{ matrix.env }}
+
+runs:
+  using: composite
+  steps:
+  - name: setup (windows)
+    shell: bash
+    if: runner.os == 'Windows'
+    run: |
+      set -x
+
+      echo 'TEMP=C:\TEMP' >> "$GITHUB_ENV"
+
+      echo "$CONDA\Scripts" >> "$GITHUB_PATH"
+
+      echo 'C:\Strawberry\perl\bin' >> "$GITHUB_PATH"
+      echo 'C:\Strawberry\perl\site\bin' >> "$GITHUB_PATH"
+      echo 'C:\Strawberry\c\bin' >> "$GITHUB_PATH"
+
+      testing/get-dart.sh
+      pwsh testing/get-r.ps1
+  - name: setup (linux)
+    shell: bash
+    if: runner.os == 'Linux'
+    run: |
+      set -x
+
+      sudo apt-get update
+      sudo apt-get install -y --no-install-recommends \
+        lua5.3 \
+        liblua5.3-dev \
+        luarocks \
+        r-base
+
+      testing/get-coursier.sh
+      testing/get-dart.sh
+      testing/get-swift.sh
+  - uses: asottile/workflows/.github/actions/latest-git@v1.2.0
+    if: inputs.env == 'py38' && runner.os == 'Linux'

.github/workflows/main.yml

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+name: main
+
+on:
+  push:
+    branches: [main, test-me-*]
+    tags:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  main-windows:
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.2.0
+    with:
+      env: '["py38"]'
+      os: windows-latest
+  main-linux:
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.2.0
+    with:
+      env: '["py38", "py39", "py310"]'
+      os: ubuntu-latest