Migrate to GitHub Actions (#562)

This removes the Travis CI integration in favor of Github Actions.

Co-authored-by: Yukthi Suresh <yukthi94@gmail.com>

.github/pysb-conda-env.yml

@@ -0,0 +1,26 @@
+---
+name: pysb
+channels:
+  - conda-forge
+dependencies:
+  - alubbock::bionetgen
+  - alubbock::atomizer
+  - alubbock::kappa
+  - numpy
+  - scipy
+  - sympy
+  - cython
+  - matplotlib
+  - networkx
+  - nose
+  - h5py
+  - pexpect
+  - pandas
+  - pydot
+  - coverage
+  - coveralls
+  - mock
+  - pip
+  - pip:
+      - libroadrunner
+      - python-libsbml

.github/workflows/build.yml

@@ -0,0 +1,48 @@
+---
+name: build
+on: [push]
+
+jobs:
+  build-linux:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        exclude:
+          # Fails due to Atomizer linker/runtime issue
+          - os: windows-latest
+            python-version: 3.7
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+          environment-file: .github/pysb-conda-env.yml
+          activate-environment: pysb
+      - name: Install StochKit (except on Windows)
+        if: matrix.os != 'windows-latest'
+        run: conda install -y -c alubbock stochkit
+      - name: Install StochKit Lite (Windows only)
+        if: matrix.os == 'windows-latest'
+        run: conda install -y -c alubbock -c conda-forge stochkit-lite
+      - name: Fix gfortran DLL linker error on Windows/Python 3.8
+        if: matrix.os == 'windows-latest' && matrix.python-version == '3.8'
+        run: pip install --upgrade --force-reinstall scipy
+      - name: Conda environment info
+        run: |
+          conda info
+          conda list
+      - name: Build PySB
+        run: python setup.py build --build-lib=build/lib
+      - name: Run nosetests
+        run: >
+          nosetests
+          build/lib/pysb
+          --with-coverage --cover-inclusive --cover-package=build/lib/pysb
+          -a '!gpu'