Add push workflow.

.github/workflows/push.yml

@@ -0,0 +1,32 @@
+name: Run linting and tests when pushing code.
+
+on: [push]
+
+jobs:
+  linting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - uses: pre-commit/[email protected]
+
+  testing:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'poetry'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip poetry
+          poetry install
+      - name: Test with pytest
+        run: poetry run pytest