Switch to OpenAstronomy GitHub Action setup

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+    - main
+    - stable
+    - v*.*.x
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
+    with:
+      envs: |
+        - linux: py311
+        - macos: py310
+        - windows: py39
+        - linux: build_docs
+          libraries:
+            apt:
+            - pandoc
+          with:
+            PYDEVD_DISABLE_FILE_VALIDATION: 1
+
+#      coverage: 'codecov'
+#    secrets:
+#      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

tox.ini

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+[tox]
+envlist = clean,py310,build_docs
+isolated_build = True
+
+[testenv]
+allowlist_externals =
+    /bin/bash
+    /usr/bin/bash
+    echo
+setenv =
+    MPLBACKEND = agg
+    COLUMNS = 180
+    PYTEST_COMMAND = pytest --pyargs xrtpy
+extras = tests
+deps =
+    cov: pytest-cov
+    pytest-github-actions-annotate-failures
+commands =
+    all: {env:PYTEST_COMMAND} {posargs}
+    cov-all: {env:PYTEST_COMMAND} {posargs} --cov=xrtpy --cov-report=xml --cov-config={toxinidir}{/}setup.cfg --cov-append --cov-report xml:coverage.xml
+
+description =
+    run tests
+    minimal: with minimal versions of dependencies
+    cov: with code coverage
+
+[testenv:clean]
+deps = coverage
+skip_install = true
+commands = coverage erase
+
+[testenv:build_docs]
+changedir = {toxinidir}
+extras = docs
+setenv =
+    HOME = {envtmpdir}
+commands = sphinx-build docs docs{/}_build{/}html -W -n --keep-going -b html {posargs}