Add GitHub Actions CI workflow

.github/workflows/pytest-coverage.yaml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - '*'
+  pull_request:
+    branches:
+    - '*'
+
+jobs:
+  test-coverage:
+    name: pytest & coverage report
+    runs-on: 'ubuntu-latest'
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.6', '3.7']
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: goanpeca/setup-miniconda@v1
+        with:
+           auto-update-conda: true
+           auto-activate-base: false
+           environment-file: envs/environment-test.yaml
+           python-version: ${{ matrix.python-version }}
+           activate-environment: salishsea-site-test
+
+      - name: Install package
+        shell: bash -l {0}
+        run: |
+          python3 -m pip install --editable $GITHUB_WORKSPACE
+
+      - name: pytest package with coverage
+        shell: bash -l {0}
+        run: |
+          pytest --cov=$GITHUB_WORKSPACE --cov-report=xml
+
+      - uses: pioug/le-slack-message@v1.0.0
+        with:
+          ACTION_NAME: ${{ github.repository }} pytest suite for Python ${{ matrix.python-version }}
+          JOB: ${{ toJson(job) }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+        if: always()
+
+      - name: Upload coverage report to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
+          flags: unittests
+        if: always()

envs/environment-test.yaml

@@ -0,0 +1,30 @@
+# conda environment description file for salishsea-site package testing environment
+#
+# Creates a conda environment in which the salishsea-site package unit tests and
+# coverage analysis can be run.
+# Primarily intended for creation of a conda env for use in a GitHub Actions workflow.
+
+name: salishsea-site-test
+
+channels:
+  - conda-forge
+  - defaults
+
+dependencies:
+  - pip
+  - pyyaml
+  - requests
+
+  # For unit tests and coverage monitoring
+  - pytest
+  - pytest-cov
+
+  - pip:
+    - arrow
+    - attrs
+    - pyramid
+    - pyramid_debugtoolbar
+    - pyramid_mako
+    - sentry-sdk
+    - supervisor
+    - waitress