Add GHA to check version has changed

.github/workflows/check-version.yml

@@ -0,0 +1,45 @@
+# Check that the version has changed in setup.py.
+# Changing the code but not the version breaks `pip install` for projects that depend on this
+# package via marqo_commons @ git+https://github.com/marqo-ai/marqo-commons.git@main#egg=marqo_commons
+name: Check Version
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "requirements.txt"
+      - "setup.py"
+      - "src/**"
+
+jobs:
+  test:
+    name: Run Pytest
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.8
+
+      - name: Check that version has changed
+        run: |
+          # Get the version from setup.py at the base branch
+          BASE_BRANCH=main
+          BASE_VERSION=$(git show ${BASE_BRANCH}:setup.py | grep version | head -n1 | cut -d'"' -f2)
+
+          # Get the version from setup.py at the current branch
+          CURRENT_VERSION=$(grep version setup.py | head -n1 | cut -d'"' -f2)
+
+          # Check if the versions are the same
+          if [ "$BASE_VERSION" == "$CURRENT_VERSION" ]; then
+            echo "Version has not changed"
+            exit 1
+          fi