Add CI + dependabot and update packages (#1)

* Add CI + update packages

* re-run black

* update cache

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.11
+
+      - name: cache poetry install
+        uses: actions/cache@v3
+        with:
+          path: ~/.local
+          key: poetry-0
+
+      - uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: cache deps
+        id: cache-deps
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: pydeps-${{ hashFiles('**/poetry.lock') }}
+
+      - run: poetry install --no-interaction --no-root
+        if: steps.cache-deps.outputs.cache-hit != 'true'
+
+      - run: poetry install --no-interaction
+
+      - run: poetry run pytest tests.py
+      - run: poetry run black mudder.py tests.py
+      - run: poetry run flake8 mudder.py