To upload asset on github release from travis-ci build

travis2githubassetupload.sh

if [ -f $1 ]; then
  echo "Start try upload asset $1 to ${TRAVIS_PULL_REQUEST_SLUG} on tag: ${TRAVIS_TAG} at $(date)..."
  ASSETTAGID=$(curl --no-progress-meter -q -u "${GITHUB_UPLOAD_USERNAME}:${GITHUB_UPLOAD_TOKEN}" \
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/${TRAVIS_PULL_REQUEST_SLUG}/releases/tags/${TRAVIS_TAG} | awk '/"assets": /{flag=1}/"id": /{sub(",$","",$2);id=$2;}/"name": /{sub("^\"","",$2); sub("\",$","",$2);name=$2; if (name=="'"$1"'") {print id;exit}}')
  ASSETURL=$(curl --no-progress-meter -q -u "${GITHUB_UPLOAD_USERNAME}:${GITHUB_UPLOAD_TOKEN}" \
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/${TRAVIS_PULL_REQUEST_SLUG}/releases/tags/${TRAVIS_TAG} | awk '/"assets_url": /{sub("^\"","",$2); sub("\",$","",$2); sub("^https://api[.]","https://uploads.",$2);print $2;exit}')

  if [ -z "${ASSETURL}" ]; then
          curl --no-progress-meter -q -u "${GITHUB_UPLOAD_USERNAME}:${GITHUB_UPLOAD_TOKEN}" \
                        -H "Accept: application/vnd.github.v3+json" \
                        https://api.github.com/repos/${TRAVIS_PULL_REQUEST_SLUG}/releases/tags/${TRAVIS_TAG}
          echo "Tag : ${TRAVIS_TAG} not found on project: ${TRAVIS_PULL_REQUEST_SLUG}..."
          exit 2
  fi

  if [ ! -z "$ASSETTAGID" ]; then
          echo "Asset $1 are already uploaded on Tag: ${TRAVIS_TAG}!"
          echo "I must Delete $1 before upload..."
          curl  -u "${GITHUB_UPLOAD_USERNAME}:${GITHUB_UPLOAD_TOKEN}" \
                -X DELETE \
                -H "Accept: application/vnd.github.v3+json" \
                https://api.github.com/repos/${TRAVIS_PULL_REQUEST_SLUG}/releases/assets/${ASSETTAGID}
          if [ $? -eq 0 ]; then echo "Delete done!"
          else echo "Delete failed!"; exit 1; fi
  fi

  echo "Uploading asset $1 to ${TRAVIS_PULL_REQUEST_SLUG} on tag: ${TRAVIS_TAG}..."
  curl  --no-progress-meter -q -u "${GITHUB_UPLOAD_USERNAME}:${GITHUB_UPLOAD_TOKEN}" \
        -X POST \
        --data-binary @$1 \
        -H "Content-Type: application/zip" \
        -H "Accept: application/vnd.github.v3+json" \
        $ASSETURL?name=$1 >response.json
  if [ $? -eq 0 ]; then echo "Success upload of asset $1 to ${TRAVIS_PULL_REQUEST_SLUG} on tag: ${TRAVIS_TAG} at $(date)...";
  else cat response.json; echo "Failed upload of upload asset $1 to ${TRAVIS_PULL_REQUEST_SLUG} on tag: ${TRAVIS_TAG} at $(date)..."; fi
fi

set GITHUB_UPLOAD_USERNAME and GITHUB_UPLOAD_TOKEN in environement variable on travis settings of the project.
and execute bash travis2githubassetupload.sh "myfile.zip"