fix(release): pin GNU Linux builds to ubuntu-22.04

.github/workflows/pub-release.yml

@@ -165,7 +165,9 @@ jobs:
             fail-fast: false
             matrix:
                 include:
-                    - os: blacksmith-2vcpu-ubuntu-2404
+                    # Keep GNU Linux release artifacts on Ubuntu 22.04 to preserve
+                    # a broadly compatible GLIBC baseline for user distributions.
+                    - os: ubuntu-22.04
                       target: x86_64-unknown-linux-gnu
                       artifact: zeroclaw
                       archive_ext: tar.gz
@@ -180,7 +182,7 @@ jobs:
                       linker_env: ""
                       linker: ""
                       use_cross: true
-                    - os: blacksmith-2vcpu-ubuntu-2404
+                    - os: ubuntu-22.04
                       target: aarch64-unknown-linux-gnu
                       artifact: zeroclaw
                       archive_ext: tar.gz
@@ -195,7 +197,7 @@ jobs:
                       linker_env: ""
                       linker: ""
                       use_cross: true
-                    - os: blacksmith-2vcpu-ubuntu-2404
+                    - os: ubuntu-22.04
                       target: armv7-unknown-linux-gnueabihf
                       artifact: zeroclaw
                       archive_ext: tar.gz