ci-package-builder:

Commit bd9e1697 "Automatically freeze stable branches" uses the wrong YAML multiline syntax and since it trims newlines it produces an invalid shell snippet, breaking merge pipelines with this error:

$ if echo $CI_MERGE_REQUEST_TARGET_BRANCH_NAME | grep -Ev '(dev[0-9]|pre)$' then # collapsed multi-line command
/bin/bash: eval: line 124: syntax error near unexpected token `fi'

Switch from > to | to preserve newlines in the snippet.