feat: add auto version tagging workflow

- Automatically creates git tags when version changes in config.gradle
- Monitors config.gradle changes on main branch
- Creates annotated tags in format v{version}
- Triggers release workflow automatically via tag creation
- Prevents duplicate tags and provides clear status summaries

Author: graycreate

.github/workflows/version-change-trigger.yml

@@ -0,0 +1,88 @@
+name: Version Change Trigger
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'config.gradle'
+
+permissions:
+  contents: write
+
+jobs:
+  check-and-tag:
+    name: Check Version and Create Tag
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 2  # Need previous commit for comparison
+        
+    - name: Check if version changed
+      id: version_check
+      run: |
+        # Get version from current commit
+        CURRENT_VERSION=$(grep versionName config.gradle | cut -d'"' -f2)
+        CURRENT_CODE=$(grep versionCode config.gradle | grep -o '[0-9]*')
+        
+        # Get version from previous commit
+        git checkout HEAD~1 config.gradle 2>/dev/null || true
+        PREV_VERSION=$(grep versionName config.gradle | cut -d'"' -f2 || echo "")
+        PREV_CODE=$(grep versionCode config.gradle | grep -o '[0-9]*' || echo "0")
+        
+        # Restore current version
+        git checkout HEAD config.gradle
+        
+        echo "Previous: v$PREV_VERSION (code: $PREV_CODE)"
+        echo "Current: v$CURRENT_VERSION (code: $CURRENT_CODE)"
+        
+        if [ "$CURRENT_VERSION" != "$PREV_VERSION" ] || [ "$CURRENT_CODE" != "$PREV_CODE" ]; then
+          echo "version_changed=true" >> $GITHUB_OUTPUT
+          echo "version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
+          echo "version_code=$CURRENT_CODE" >> $GITHUB_OUTPUT
+        else
+          echo "version_changed=false" >> $GITHUB_OUTPUT
+        fi
+        
+    - name: Check if tag exists
+      if: steps.version_check.outputs.version_changed == 'true'
+      id: tag_check
+      run: |
+        TAG_NAME="v${{ steps.version_check.outputs.version }}"
+        if git ls-remote --tags origin | grep -q "refs/tags/${TAG_NAME}$"; then
+          echo "tag_exists=true" >> $GITHUB_OUTPUT
+        else
+          echo "tag_exists=false" >> $GITHUB_OUTPUT
+        fi
+        
+    - name: Create and push tag
+      if: steps.version_check.outputs.version_changed == 'true' && steps.tag_check.outputs.tag_exists == 'false'
+      run: |
+        TAG_NAME="v${{ steps.version_check.outputs.version }}"
+        
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+        
+        # Create annotated tag
+        git tag -a "${TAG_NAME}" -m "Release ${TAG_NAME} (code: ${{ steps.version_check.outputs.version_code }})"
+        git push origin "${TAG_NAME}"
+        
+        echo "✅ Created and pushed tag: ${TAG_NAME}"
+        
+    - name: Summary
+      if: steps.version_check.outputs.version_changed == 'true'
+      run: |
+        echo "## 📦 Version Update Detected" >> $GITHUB_STEP_SUMMARY
+        echo "" >> $GITHUB_STEP_SUMMARY
+        echo "- **Version**: v${{ steps.version_check.outputs.version }}" >> $GITHUB_STEP_SUMMARY
+        echo "- **Version Code**: ${{ steps.version_check.outputs.version_code }}" >> $GITHUB_STEP_SUMMARY
+        if [ "${{ steps.tag_check.outputs.tag_exists }}" == "false" ]; then
+          echo "- **Tag**: ✅ Created v${{ steps.version_check.outputs.version }}" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "The release workflow will be triggered automatically by the new tag." >> $GITHUB_STEP_SUMMARY
+        else
+          echo "- **Tag**: Already exists" >> $GITHUB_STEP_SUMMARY
+        fi