Added some workflows for CI testing and code formatting

.github/workflows/continuous-integration.yml

@@ -0,0 +1,25 @@
+name: Macrostrat continuous integration testing
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '^3.11'
+
+      - name: Install Poetry
+        run: curl -sSL https://install.python-poetry.org | python3 -
+
+      - name: Install dependencies
+        run: poetry install
+
+      - name: Run Macrostrat tests
+        run: make test

.github/workflows/format-code.yml

@@ -8,13 +8,13 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.head_ref }}
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v5.2.0
         with:
-          python-version: '3.x'
-      - uses: actions/cache@v2
+          python-version: '^3.11'
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cache/pypoetry