Please review this test-only fix. For non-ascii vendor strings the hotspot container tests fail in fastdebug because the encoding of the vendor string doesn't match. Full details in [JDK-8375471](https://bugs.openjdk.org/browse/JDK-8375471). In order to avoid the assert, the containers need to set to an UTF-8 encoding. This patch proposes to do so by setting `LANG=C.UTF-8`.
Thoughts? **Testing:** - [x] GHA - [x] Linux container tests on cg v1 and cg v2 with a JDK build and vendor string `Foo bar öÜß` and fastdebug. All pass. Most failed before. ------------- Commit messages: - 8375692: Hotspot container tests assert with non-ascii vendor name Changes: https://git.openjdk.org/jdk/pull/29315/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29315&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8375692 Stats: 5 lines in 3 files changed: 4 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/29315.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29315/head:pull/29315 PR: https://git.openjdk.org/jdk/pull/29315
