[gcc/devel/rust/master] ci: Run GCC 4.8 job in Ubuntu 18.04 container

[gcc/devel/rust/master] ci: Run GCC 4.8 job in Ubuntu 18.04 container

[Thomas Schwinge]

https://gcc.gnu.org/g:429e258dbe70b8277f3cef26392503c21a68f374

commit 429e258dbe70b8277f3cef26392503c21a68f374
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Tue Feb 21 14:08:10 2023 +0100

    ci: Run GCC 4.8 job in Ubuntu 18.04 container
    
    We should probably think about building GCC 4.8 from source from time
    to time and hosting the image on our Dockerhub, but I think this is okay
    as well for now.
    
    ChangeLog:
    
            * .github/workflows/ccpp.yml: Run GCC 4.8 action in ubuntu 18.04 container

Diff:
---
 .github/workflows/ccpp.yml | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 0e95c04625e..fc8acc6776c 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -166,14 +166,18 @@ jobs:
 
   build-and-check-gcc-48:
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
+    container: ubuntu:18.04
+    env:
+      # otherwise we hang when installing tzdata
+      DEBIAN_FRONTEND: noninteractive
     steps:
     - uses: actions/checkout@v2
 
     - name: Install Deps
       run: |
-          sudo apt-get update;
-          sudo apt-get install -y \
+          apt-get update;
+          apt-get install -y \
                   automake \
                   autoconf \
                   libtool \