ci: raise Buildah nofile limit for Zig AOT [CI]

ci/build-dev-image.sh

@@ -140,7 +140,9 @@ commit_epoch="$(git -C "$root" show -s --format=%ct "$CI_COMMIT_SHA")"
 built_at="$(date -u -d "@$commit_epoch" +%Y-%m-%dT%H:%M:%SZ)"
 
 python3 "$root/ci/stage-node-image.py" "$component" "$context"
-run_bounded 30m buildah bud --layers --network host --tls-verify=true --arch "$arch" \
+# Zig compiles musl libc by spawning many compiler processes. Buildah's default
+# nofile limit (1024) makes Zig fail with ProcessFdQuotaExceeded while linking.
+run_bounded 30m buildah bud --layers --network host --tls-verify=true --ulimit nofile=65536:65536 --arch "$arch" \
   --build-arg "NATIVEAOT_BUILDER_IMAGE=$builder_image" \
   --build-arg "APP_VERSION=$image_version" \
   --build-arg "NODE_RID=$node_rid" \