add CI workflow for GitHub Actions (#2)

Add a CI workflow to test the code in this repository using GitHub Actions.

Author: Tom Dyas

.github/workflows/pants.yaml

@@ -0,0 +1,58 @@
+# Copyright 2022 Pants project contributors.
+# Licensed under the Apache License, Version 2.0 (see LICENSE).
+
+# See https://pants.readme.io/docs/using-pants-in-ci for tips on how to set up your CI with Pants.
+
+name: Pants
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  org-check:
+    name: Check GitHub Organization
+    if: ${{ github.repository_owner == 'pantsbuild' }}
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Noop
+        run: "true"
+  build:
+    name: Perform CI Checks
+    needs: org-check
+    env:
+      PANTS_CONFIG_FILES: pants.ci.toml
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      id: cache
+      with:
+        path: |
+          ~/.cache/pants/setup
+          ~/.cache/pants/lmdb_store
+          ~/.cache/pants/named_caches
+        key: ${{ runner.os }}-
+    - name: Setup Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Bootstrap Pants
+      run: |
+        ./pants --version
+    - name: Check BUILD files
+      run: ./pants tailor --check update-build-files --check
+    - name: Test
+      run: |
+        ./pants test ::
+    - name: Upload pants log
+      uses: actions/upload-artifact@v2
+      with:
+        name: pants-log
+        path: .pants.d/pants.log
+      if: always()  # We want the log even on failures.

pants.ci.toml

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+# Copyright 2022 Pants project contributors.
+# Licensed under the Apache License, Version 2.0 (see LICENSE).
+
+# See https://www.pantsbuild.org/docs/using-pants-in-ci.
+
+[GLOBAL]
+dynamic_ui = false
+colors = true
+
+[pytest]
+args = ["-vv", "--no-header"]