Add basic test for Python 3.6 and 3.8

.github/workflows/python-package.yml

@@ -0,0 +1,49 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python package
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '30 4 * * 1' # Every Monday @ 4h30am UTC
+
+jobs:
+   check_skip:
+    runs-on: ubuntu-latest
+    if: |
+      !contains(format('{0} {1} {2}', github.event.head_commit.message, github.event.pull_request.title, github.event.pull_request.body), '[skip ci]')
+    steps:
+      - run: |
+          cat <<'MESSAGE'
+          github.event_name: ${{ toJson(github.event_name) }}
+          github.event:
+          ${{ toJson(github.event) }}
+          MESSAGE
+   test:
+    needs: check_skip
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.6","3.8"]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        if [ -f requirements.txt ]; then 
+          pip install -r requirements.txt; 
+        else
+          pip install .;
+        fi
+    - name: Test
+      run: |
+        simms -dir "J2000,04h00m00.0s,-33d00m00s" -T vla -dt 8 -st 0.5 -sl 0.16667 -nc 32 -f0 856MHz -df 26749.9904kHz -pl XX YY -n mk64.0.5hr.10min.scan.8s.208khz.J0400-3300.ms