refactor: improve Docker image pull string construction in Gitea CI workflow using jq arguments

.gitea/workflows/cicd.yml

@@ -103,9 +103,8 @@ jobs:
             
             # Check if Docker Image section already exists
             if [[ "$OLD_BODY" != *"## 🐳 Docker Image"* ]]; then
-              NEW_BODY="${OLD_BODY}\n\n## 🐳 Docker Image\n\`\`\`bash\ndocker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${TAG_NAME}\n\`\`\`"
-              
-              jq -n --arg body "$NEW_BODY" '{body: $body}' | \
+              jq -n --arg old "$OLD_BODY" --arg img "${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${TAG_NAME}" \
+                '{body: ($old + "\n\n## 🐳 Docker Image\n```bash\ndocker pull " + $img + "\n```")}' | \
               curl -s -X PATCH \
                 -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
                 -H "Content-Type: application/json" \