Enh: Enable GitHub CI

.github/requirements.yml

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+dependencies:
+ - flake8
+ - pytest

.github/workflows/push_pr.yml

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+name: Run code tests on push and pull requests
+on:
+  push:
+  pull_request:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  tests:
+    name: Code tests (Python ${{ matrix.python-version }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+        matrix:
+            os: ["ubuntu-latest"]
+            python-version: ["3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+          lfs: true
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+          activate-environment: test
+          environment-file: .github/requirements.yml
+          auto-activate-base: false
+          channels: conda-forge
+      - shell: bash -l {0}
+        run: |
+          conda info
+          conda list
+      # - name: Lint
+      #   shell: bash -l {0}
+      #   run: |
+      #       python -m flake8 pypulseq
+      - name: Run pytest
+        shell: bash -l {0}
+        run: |
+            pip install .
+            pytest pypulseq/tests