ci: install-musl: upgrade to 1.2.3

This will be chosen based on the RUST_LIBC_UNSTABLE_MUSL_V1_2_3
variable.

Co-authored-by: Daniel Frampton <Daniel.Frampton@microsoft.com>

(backport <rust-lang#4443>)
(cherry picked from commit e7762a8)

Author: xbjfk

.github/workflows/ci.yaml

@@ -196,6 +196,18 @@ jobs:
             env:
               RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS: 64
             artifact-tag: offset-bits64
+          - target: aarch64-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: arm-unknown-linux-musleabihf
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: i686-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: loongarch64-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
           # FIXME(ppc): SIGILL running tests, see
           # https://github.com/rust-lang/libc/pull/4254#issuecomment-2636288713
           # - target: powerpc-unknown-linux-gnu

ci/install-musl.sh

@@ -10,7 +10,7 @@ case ${1} in
         musl_version=1.2.5
         ;;
     *)
-        musl_version=1.1.24
+        [ -n "${RUST_LIBC_UNSTABLE_MUSL_V1_2_3:-}" ] && musl_version=1.2.3 || musl_version=1.1.24
         ;;
 esac