GHA: Make the reftests pass with the macos GHA runner-images >= 20250928

Author: kit-ty-kate

master_changes.md

@@ -150,6 +150,7 @@ users)
   * Update `sed-cmd` reftest reftest [#6675 @rjbou]
   * Add a test showing the behaviour of nested extra-files [#6715 @kit-ty-kate]
   * Add opam file loading tests to `update.test` to demonstrate current behaviour of loading full repository instead of only changed files. [#6614 @arozovyk @rjbou @kit-ty-kate]
+  * Fix `env.test` in cases where calling `env` inside of a script outputs a `__CF_USER_TEXT_ENCODING` environment variable that isn't present in `sh -c env` [#6719 @kit-ty-kate]
 
 ### Engine
   * Fix gcc < 14.3 bug on mingw i686 [#6624 @kit-ty-kate]

tests/reftests/env.test

@@ -581,7 +581,7 @@ opam-version: "2.0"
 build: [ "sh" "getenv.sh" "1" ]
 ### <pkg:to-build.2:getenv.sh>
 out=build-env
-fromtest="^PATH=\|^MANPATH=\|^LOCALENV=\|^TEMPDIR=\|^TMPDIR=\|^TMP=\|^TEMP=\|^SHLVL=\|^PWD=\|^_="
+fromtest="^PATH=\|^MANPATH=\|^LOCALENV=\|^TEMPDIR=\|^TMPDIR=\|^TMP=\|^TEMP=\|^SHLVL=\|^PWD=\|^_=\|^__CF_USER_TEXT_ENCODING="
 for v in $LOCALENV; do
   if echo "$v" | grep -q "=" ; then
     fromtest="$fromtest\\|^$(echo "$v" | cut -f 1 -d '=')="