Port CI to gh-actions

.github/workflows/ets-from-source.yml

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+name: Test with EDM using ETS packages from source
+
+on:
+  schedule:
+    - cron:  '0 0 * * 5'
+
+
+env:
+  INSTALL_EDM_VERSION: 3.2.3
+
+jobs:
+
+  # Test against EDM packages
+  test-with-edm:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      # Set root directory, mainly for Windows, so that the EDM Python
+      # environment lives in the same drive as the cloned source. Otherwise
+      # 'pip install' raises an error while trying to compute
+      # relative path between the site-packages and the source directory.
+      EDM_ROOT_DIRECTORY: ${{ github.workspace }}/.edm
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cache EDM packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache
+          key: ${{ runner.os }}-${{ matrix.toolkit }}-${{ hashFiles('etstool.py') }}
+      - name: Setup EDM
+        uses: enthought/setup-edm-action@v1
+        with:
+          edm-version: ${{ env.INSTALL_EDM_VERSION }}
+      - name: Install click to the default EDM environment
+        run: edm install -y wheel click coverage
+      - name: Install test environment
+        run: edm run -- python etstool.py install --source
+      - name: Run tests
+        uses: GabrielBB/xvfb-action@v1
+        with:
+          run: edm run -- python etstool.py test

.github/workflows/test-with-edm.yml

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+# This workflow targets stable released dependencies from EDM.
+# Note that some packages may not actually be installed from EDM but from
+# PyPI, see etstool.py implementations.
+
+name: Test with EDM
+
+on: pull_request
+
+env:
+  INSTALL_EDM_VERSION: 3.2.3
+
+jobs:
+
+  # Test against EDM packages
+  test-with-edm:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      # Set root directory, mainly for Windows, so that the EDM Python
+      # environment lives in the same drive as the cloned source. Otherwise
+      # 'pip install' raises an error while trying to compute
+      # relative path between the site-packages and the source directory.
+      EDM_ROOT_DIRECTORY: ${{ github.workspace }}/.edm
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cache EDM packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache
+          key: ${{ runner.os }}-${{ matrix.toolkit }}-${{ hashFiles('etstool.py') }}
+      - name: Setup EDM
+        uses: enthought/setup-edm-action@v1
+        with:
+          edm-version: ${{ env.INSTALL_EDM_VERSION }}
+      - name: Install click to the default EDM environment
+        run: edm install -y wheel click coverage
+      - name: Install test environment
+        run: edm run -- python etstool.py install
+      - name: Flake8
+        run: edm run -- python etstool.py flake8
+        if: startsWith(matrix.os, 'ubuntu')
+      - name: Run tests
+        uses: GabrielBB/xvfb-action@v1
+        with:
+          run: edm run -- python etstool.py test