error in the `create_istio_release.sh` script

[yskopets]

Summary

• The output of create-test-images step contains the following error message:

  ./tetrateci/create_istio_release.sh: line 83: [: =~: binary operator expected

• the line in question does some fips-related check

  # fips go versions are like 1.14.12b5, extra checking to not miss anything
  if [ ${TAG} =~ "fips" ]; then 
      [[ $BUILD_GO_VERSION =~ 1.[0-9]+.[0-9]+[a-z][0-9]$ ]] || exit 1
  fi  

• shellcheck reports the following error for this line:

  In ./tetrateci/create_istio_release.sh line 83:
  if [ ${TAG} =~ "fips" ]; then
              ^-- SC2074: Can't use =~ in [ ]. Use [[..]] instead.  

Examples

• CI job #1