tests: Add v22-0 tag for compiler-tests docker images

Change-Id: I72247e9371e6a1caf6c693e30fd3d9478fcbaab6
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60569
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

tests/compiler-tests.sh

@@ -103,7 +103,7 @@ for compiler in ${images[@]}; do
     # targets for this test
     build_indices=(${build_permutation[@]:0:$builds_count})
 
-    repo_name="${base_url}/${compiler}:latest"
+    repo_name="${base_url}/${compiler}:v22-0"
 
     # Grab compiler image
     docker pull $repo_name >/dev/null