Migrate testing pipeline to GitHub Actions (#1985)

* Migrate testing pipeline to GitHub Actions

* Change branch target on push trigger

* Remove if condition in Codecov step

* Remove depth parameter in checkout step

* Remove blank line

* Try splitting lines in YAML file

* Remove manual trigger

* Try splitting lines in YAML file (again)

* Change Azure badge for GA; Fix Open in VSCode badge; Rearrange badges

* Try splitting lines in YAML file (again)

* Remove blank line

.github/workflows/tests.yml

@@ -0,0 +1,64 @@
+#  For more information about TARDIS pipelines, please refer to:
+#
+#    https://tardis-sn.github.io/tardis/development/continuous_integration.html
+
+name: tests
+
+on:
+  push:
+    branches:
+    - '*'
+
+  pull_request:
+    branches:
+    - '*'
+
+concurrency:
+  group: tests-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  PYTEST_FLAGS: --tardis-refdata=${{ github.workspace }}/tardis-refdata
+                --cov=tardis --cov-report=xml --cov-report=html
+  CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Clone tardis-sn/tardis-refdata
+        uses: actions/checkout@v2
+        with:
+          repository: tardis-sn/tardis-refdata
+          path: tardis-refdata
+          lfs: true
+
+      - name: Setup environment
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+            miniforge-variant: Mambaforge
+            miniforge-version: latest
+            environment-file: tardis_env3.yml
+            activate-environment: tardis
+            use-mamba: true
+
+      - name: Install package
+        run: pip install -e .
+
+      - name: Run tests
+        run: pytest tardis ${{ env.PYTEST_FLAGS }}
+
+      - name: Upload to Codecov
+        run: bash <(curl -s https://codecov.io/bash)

README.rst

@@ -2,48 +2,46 @@
 TARDIS
 ======
 
-TARDIS is a tool that creates synthetic observations (*spectra*) for exploding
-stars (*supernovae*).
-
 .. image:: https://img.shields.io/badge/Donate-to%20TARDIS-brightgreen.svg
     :target: https://numfocus.salsalabs.org/donate-to-tardis/index.html
 
-.. image:: https://open.vscode.dev/badges/open-in-vscode.svg
+.. image:: https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A
+    :target: http://numfocus.org
+
+.. image:: https://badges.gitter.im/Join%20Chat.svg
+    :target: https://gitter.im/tardis-sn/tardis
+
+.. image:: https://img.shields.io/static/v1?logo=visualstudiocode&label=&message=Open%20in%20Visual%20Studio%20Code&labelColor=2c2c32&color=007acc&logoColor=007acc
     :target: https://open.vscode.dev/tardis-sn/tardis
+|
+
+TARDIS is a tool that creates synthetic observations (*spectra*) for exploding
+stars (*supernovae*).
 
 .. image:: https://codecov.io/gh/tardis-sn/tardis/branch/master/graph/badge.svg
     :target: https://codecov.io/gh/tardis-sn/tardis
 
 .. image:: https://img.shields.io/endpoint?url=https://jsonbin.org/tardis-bot/tardis/badges/docstr-cov
     :target: https://github.com/tardis-sn/tardis/actions/workflows/docstr-cov.yml?query=branch%3Amaster
 
-.. image:: https://img.shields.io/badge/DOI-10.5281%2Fzenodo.592480-blue
-    :target: https://doi.org/10.5281/zenodo.592480
-
-.. image:: https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A
-    :target: http://numfocus.org
-    :alt: Powered by NumFOCUS
-
-.. image:: http://img.shields.io/badge/powered%20by-AstroPy-orange.svg?style=flat
-    :target: http://www.astropy.org
-
-.. image:: https://badges.gitter.im/Join%20Chat.svg
-    :target: https://gitter.im/tardis-sn/tardis
-
-.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
-    :target: https://github.com/psf/black
+.. image:: https://github.com/tardis-sn/tardis/actions/workflows/tests.yml/badge.svg
+    :target: https://github.com/tardis-sn/tardis/actions/workflows/tests.yml
 
 .. image:: https://github.com/tardis-sn/tardis/actions/workflows/documentation-build.yml/badge.svg
     :target: https://tardis-sn.github.io/tardis/index.html
 
-.. image:: https://dev.azure.com/tardis-sn/TARDIS/_apis/build/status/TARDIS%20tests?branchName=master
-    :target: https://dev.azure.com/tardis-sn/TARDIS/_build/latest?definitionId=6&branchName=master
-
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+    :target: https://github.com/psf/black
+|
 
 ******************************
 Credits & Publication Policies
 ******************************
 
+.. image:: https://img.shields.io/badge/DOI-10.5281%2Fzenodo.592480-blue
+    :target: https://doi.org/10.5281/zenodo.592480
+|
+
 We provide TARDIS as a free, open-source tool. If you are using it, please
 adhere to a few policies and acknowledge the TARDIS Team.
 
@@ -188,6 +186,9 @@ The following BibTeX entries are needed for the references:
 *******
 License
 *******
+.. image:: http://img.shields.io/badge/powered%20by-AstroPy-orange.svg?style=flat
+    :target: http://www.astropy.org
+|
 
 This project is Copyright (c) TARDIS Collaboration and licensed under
 the terms of the BSD 3-Clause license. This package is based upon