[GHA] Cleanup and cache purge via cloudflare action

.github/workflows/publish-vscode-extension.yml

@@ -16,6 +16,9 @@ on:
         required: true
         type: string
 
+env:
+  DOWNLOAD_URL_ROOT: https://cdn.spring.io/spring-tools
+
 jobs:
 
   publish-release:
@@ -26,7 +29,7 @@ jobs:
         id: download-release
         run: |
           vsix_file=${{ inputs.extension-name }}-${{ inputs.version }}-${{ inputs.postfix }}.vsix
-          wget https://cdn.spring.io/spring-tools/vscode-extensions/${{ inputs.extension-name }}/${{ inputs.version }}/release/$vsix_file
+          wget $DOWNLOAD_URL_ROOT/release/vscode-extensions/${{ inputs.extension-name }}/${{ inputs.version }}/$vsix_file
       - name: Publish to VSCode Marketplace
         id: publish-vsce
         run: |