Add linux-arm64 to the .NET/JVM native build matrix

[Ayush-Telosa]

Summary

The chat_xdk_dotnet native ships for osx-arm64, osx-x64, linux-x64 and win-x64. There is no linux-arm64, so the JVM and .NET bindings cannot run on 64-bit ARM Linux — AWS Graviton, Ampere, and ARM CI runners.

The Python binding already ships manylinux_2_17_aarch64, so this Rust target is already built in this repo's CI. Only the dotnet-build matrix skips it.

Impact

On Linux/aarch64, NativeLoader.detectRid() returns null:

} else if (os.contains("linux")) {
    if (x64) {
        return "linux-x64";
    }
}

extractBundledLibrary() then returns null, and load() falls through to the system lookup, which fails unless the operator supplies their own build. Because dotnet-build also feeds the java job, one missing matrix entry affects both bindings.

Verification

I built chat-xdk-dotnet for aarch64-unknown-linux-gnu from v0.5.0, with juicebox-sdk as a sibling checkout and the pinned 1.91.1 toolchain:

Finished `release` profile [optimized] target(s) in 1m 25s
libchat_xdk_dotnet.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked

Loaded through JNA on an ARM64 JVM (Temurin 25), with no jna.library.path set:

arch=aarch64
RESOURCE_PREFIX=linux-aarch64
LOADED OK: true

Unmodified source — same crate, same pinned toolchain, same sibling dependency. Only the target triple differs.

Suggested change

ubuntu-24.04-arm runners are already used by the Python job, so the runner and target are proven here.

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 97034d3..9a283e9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -429,6 +429,10 @@ jobs:
             rust_target: x86_64-unknown-linux-gnu
             rid: linux-x64
             lib: libchat_xdk_dotnet.so
+          - runs_on: ubuntu-24.04-arm
+            rust_target: aarch64-unknown-linux-gnu
+            rid: linux-arm64
+            lib: libchat_xdk_dotnet.so
           - runs_on: windows-latest
             rust_target: x86_64-pc-windows-msvc
             rid: win-x64
@@ -489,7 +493,7 @@ jobs:
         run: |
           set -euo pipefail
           base=crates/dotnet/dotnet/ChatXdk/runtimes
-          for rid in osx-arm64 osx-x64 linux-x64 win-x64; do
+          for rid in osx-arm64 osx-x64 linux-x64 linux-arm64 win-x64; do
             mkdir -p "$base/$rid/native"
             cp artifacts/dotnet-native-$rid/* "$base/$rid/native/"
           done
@@ -542,7 +546,7 @@ jobs:
         run: |
           set -euo pipefail
           base=crates/jvm/java/chatxdk/src/main/resources/native
-          for rid in osx-arm64 osx-x64 linux-x64 win-x64; do
+          for rid in osx-arm64 osx-x64 linux-x64 linux-arm64 win-x64; do
             mkdir -p "$base/$rid"
             cp artifacts/dotnet-native-"$rid"/* "$base/$rid/"
           done
@@ -560,6 +564,7 @@ jobs:
             native/osx-arm64/libchat_xdk_dotnet.dylib \
             native/osx-x64/libchat_xdk_dotnet.dylib \
             native/linux-x64/libchat_xdk_dotnet.so \
+            native/linux-arm64/libchat_xdk_dotnet.so \
             native/win-x64/chat_xdk_dotnet.dll \
             META-INF/LICENSE \
             META-INF/THIRD_PARTY_NOTICES.md; do
diff --git a/crates/jvm/java/chatxdk/src/main/java/com/x/chatxdk/NativeLoader.java b/crates/jvm/java/chatxdk/src/main/java/com/x/chatxdk/NativeLoader.java
index 4bc6d3b..d5eed33 100644
--- a/crates/jvm/java/chatxdk/src/main/java/com/x/chatxdk/NativeLoader.java
+++ b/crates/jvm/java/chatxdk/src/main/java/com/x/chatxdk/NativeLoader.java
@@ -61,7 +61,7 @@ final class NativeLoader {
         return out;
     }
 
-    /** RID labels aligned with the .NET / CI matrix: osx-arm64, osx-x64, linux-x64, win-x64. */
+    /** RID labels aligned with the .NET / CI matrix: osx-arm64, osx-x64, linux-x64, linux-arm64, win-x64. */
     static String detectRid() {
         String os = System.getProperty("os.name", "").toLowerCase(Locale.ROOT);
         String arch = System.getProperty("os.arch", "").toLowerCase(Locale.ROOT);
@@ -76,6 +76,9 @@ final class NativeLoader {
                 return "osx-x64";
             }
         } else if (os.contains("linux")) {
+            if (arm) {
+                return "linux-arm64";
+            }
             if (x64) {
                 return "linux-x64";
             }

Happy to open this as a PR if that is easier for you.

[Ayush-Telosa]

Closing this — I will refile from my personal account shortly. Same request, same patch.