[PATCH] ci: avoid ubuntu:rolling in most jobs for now

[Junio C Hamano <gitster@pobox.com>]

We just was hit by buggy uutils dirname in ubuntu:rolling.
Avoid breakage caused by being on the bleeding edge.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * So here is what I have near the merge of "let's test contrib/
   stuff as well" in 'seen' for today's integration to avoid getting
   hit by broken dirname in ubuntu:rolling reported earlier in

    https://lore.kernel.org/git/ef128e1d-dd3e-4573-bfcd-6a98a0a1f394@howdoi.land/

   Until uutils used by ubuntu:rolling stabilizes a bit more, we may
   want to keep a patch like this in our CI jobs.  Or we may offer
   ourselves as a guinea-pig?  I do not have strong preference
   either way.

 .github/workflows/main.yml | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f2e93f5461..0b4567c99f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -377,10 +377,10 @@ jobs:
       matrix:
         vector:
         - jobname: linux-sha256
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: clang
         - jobname: linux-reftable
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: clang
         - jobname: linux-TEST-vars
           image: ubuntu:20.04
@@ -388,20 +388,20 @@ jobs:
           cc_package: gcc-8
         - jobname: linux-breaking-changes
           cc: gcc
-          image: ubuntu:rolling
+          image: ubuntu:latest
         - jobname: fedora-breaking-changes-meson
           image: fedora:latest
         - jobname: linux-leaks
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: gcc
         - jobname: linux-reftable-leaks
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: gcc
         - jobname: linux-asan-ubsan
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: clang
         - jobname: linux-meson
-          image: ubuntu:rolling
+          image: ubuntu:latest
           cc: gcc
         - jobname: linux-musl-meson
           image: alpine:latest
-- 
2.53.0-181-gfd50f4332d