ci: cross-compile deltachat-rpc-server for aarch64 Linux

.github/workflows/deltachat-rpc-server.yml

@@ -31,6 +31,22 @@ jobs:
           path: target/x86_64-unknown-linux-musl/release/deltachat-rpc-server
           if-no-files-found: error
 
+  build_aarch64_linux:
+    name: Cross-compile deltachat-rpc-server for aarch64 Linux
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build
+        run: sh scripts/aarch64-unknown-linux-musl.sh
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: deltachat-rpc-server
+          path: target/aarch64-unknown-linux-musl/release/deltachat-rpc-server
+          if-no-files-found: error
+
   build_windows:
     name: Build deltachat-rpc-server for Windows
     strategy:

scripts/aarch64-unknown-linux-musl.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -x
+set -e
+
+# Download Zig
+rm -fr zig-linux-x86_64-0.10.1 zig-linux-x86_64-0.10.1.tar.xz
+wget https://ziglang.org/download/0.10.1/zig-linux-x86_64-0.10.1.tar.xz
+tar xf zig-linux-x86_64-0.10.1.tar.xz
+export PATH="$PATH:$PWD/zig-linux-x86_64-0.10.1"
+
+cargo install cargo-zigbuild
+
+rustup target add aarch64-unknown-linux-musl
+
+cargo zigbuild --release --target aarch64-unknown-linux-musl -p deltachat-rpc-server --features vendored