feat: Add versioning and GitHub Actions workflow for automatic tagging

- Introduced a new `version.py` file to manage the project version.
- Updated `README.md` to include a badge displaying the latest version.
- Created a GitHub Actions workflow to automatically tag the repository on changes to `version.py`, enhancing version control and deployment processes.

.github/workflows/tag-on-version.yml

@@ -0,0 +1,39 @@
+name: Tag on version.py change
+
+on:
+  push:
+    paths:
+      - 'version.py'
+    branches:
+      - main
+
+jobs:
+  tag_version:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Extract version from version.py
+        id: get_version
+        run: |
+          VERSION=$(python3 -c "exec(open('version.py').read()); print(__version__)")
+          echo "VERSION=$VERSION" >> $GITHUB_ENV
+
+      - name: Check if tag exists
+        id: check_tag
+        run: |
+          if git rev-parse "v$VERSION" >/dev/null 2>&1; then
+            echo "Tag v$VERSION already exists."
+            echo "EXISTS=true" >> $GITHUB_ENV
+          else
+            echo "EXISTS=false" >> $GITHUB_ENV
+          fi
+
+      - name: Create and push tag
+        if: env.EXISTS == 'false'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag v$VERSION
+          git push origin v$VERSION 

README.md

@@ -9,6 +9,8 @@ license: mit
 short_description: Agentic RAG that interrogates the PsTuts dataset.
 ---
 
+![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/mbudisic/PsTuts-RAG?label=version&sort=semver)
+
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
 
 # 🤖 PsTuts RAG System

version.py

@@ -0,0 +1 @@
+__version__ = "1.0.0"