Add android-arm64 architecture support

Closes #18263

Add android-arm64 binary to release builds so the extension can be
installed on Android ARM64 devices (e.g., via Termux).

Changes:
- Add android-arm64 to build-release.sh platforms array
- Add Android OS detection (via ANDROID_ROOT env var) in install script
- Add build-android Makefile target

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Mossaka

Makefile

@@ -24,7 +24,7 @@ build: sync-action-pins sync-action-scripts
 
 # Build for all platforms
 .PHONY: build-all
-build-all: build-linux build-darwin build-windows
+build-all: build-linux build-darwin build-windows build-android
 
 .PHONY: build-linux
 build-linux:
@@ -40,6 +40,10 @@ build-darwin:
 build-windows:
 	GOOS=windows GOARCH=amd64 go build $(LDFLAGS) -o $(BINARY_NAME)-windows-amd64.exe ./cmd/gh-aw
 
+.PHONY: build-android
+build-android:
+	CGO_ENABLED=0 GOOS=android GOARCH=arm64 go build $(LDFLAGS) -o $(BINARY_NAME)-android-arm64 ./cmd/gh-aw
+
 # Build WebAssembly module for browser usage
 # Optionally runs wasm-opt (from Binaryen) if available for ~8% size reduction
 .PHONY: build-wasm

actions/setup-cli/install.sh

@@ -111,7 +111,11 @@ ARCH=$(uname -m)
 # Normalize OS name
 case $OS in
     Linux)
-        OS_NAME="linux"
+        if [ -n "$ANDROID_ROOT" ]; then
+            OS_NAME="android"
+        else
+            OS_NAME="linux"
+        fi
         ;;
     Darwin)
         OS_NAME="darwin"
@@ -124,7 +128,7 @@ case $OS in
         ;;
     *)
         print_error "Unsupported operating system: $OS"
-        print_info "Supported operating systems: Linux, macOS (Darwin), FreeBSD, Windows"
+        print_info "Supported operating systems: Linux, macOS (Darwin), FreeBSD, Windows, Android (Termux)"
         exit 1
         ;;
 esac

install-gh-aw.sh

@@ -20,6 +20,7 @@ platforms=(
   linux-amd64
   linux-arm
   linux-arm64
+  android-arm64
   windows-amd64
   windows-arm64
 )