Add workflow to generate contribution snake

Introduces a GitHub Actions workflow that generates a contribution snake SVG daily and on push to main. Updates the README to reference the new SVG path in the output directory.

Author: ThomasJButler

.github/workflows/snake.yml

@@ -0,0 +1,31 @@
+name: Generate Snake
+
+on:
+  schedule:
+    # Runs at 12:00 UTC daily
+    - cron: "0 12 * * *"
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+jobs:
+  generate:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    
+    steps:
+      - name: Generate GitHub Contribution Snake
+        uses: Platane/snk/svg-only@v3
+        with:
+          github_user_name: ThomasJButler
+          outputs: |
+            dist/github-contribution-grid-snake.svg
+            dist/github-contribution-grid-snake-dark.svg?palette=github-dark
+
+      - name: Push to GitHub
+        uses: EndBug/add-and-commit@v9
+        with:
+          branch: output
+          add: 'dist/*'
+          message: 'Generate contribution snake'

README.md

@@ -126,7 +126,7 @@ The truth is, I love the technical challenges too and solving problems with code
 ---
 
 <p align="center">
- <img width="1000" src="https://raw.githubusercontent.com/ThomasJButler/ThomasJButler/output/github-contribution-grid-snake.svg" alt="snake"/>
+ <img width="1000" src="https://raw.githubusercontent.com/ThomasJButler/ThomasJButler/output/dist/github-contribution-grid-snake.svg" alt="snake"/>
 </p>