Clean up Kotlin/JVM bindings generation script

Previously, the targets built by the script was dependent on the
platform on which it was run, also delegating some of the logic to the
CI publishing scripts.

Here, we make the built targets explicit (aarch64 and x86_64 on
macOS/darwin and x86_64 on Linux) and copy the artifacts over to their
respective ressource locations.

Author: tnull

scripts/uniffi_bindgen_generate_kotlin.sh

@@ -5,19 +5,30 @@ PROJECT_DIR="ldk-node-jvm"
 PACKAGE_DIR="org/lightningdevkit/ldknode"
 UNIFFI_BINDGEN_BIN="cargo run --features=uniffi/cli --bin uniffi-bindgen"
 
-DYNAMIC_LIB_PATH="target/release/libldk_node.dylib"
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
-  DYNAMIC_LIB_PATH="target/release/libldk_node.so"
-fi
+	rustup target add x86_64-unknown-linux-gnu || exit 1
+	cargo build --release --target x86_64-unknown-linux-gnu --features uniffi || exit 1
+	DYNAMIC_LIB_PATH="target/x86_64-unknown-linux-gnu/release/libldk_node.so"
+	RES_DIR="$BINDINGS_DIR/$PROJECT_DIR/lib/src/main/resources/linux-x86-64/"
+	mkdir -p $RES_DIR || exit 1
+	cp $DYNAMIC_LIB_PATH $RES_DIR || exit 1
+else
+	rustup target add x86_64-apple-darwin || exit 1
+	cargo build --release --target x86_64-apple-darwin --features uniffi || exit 1
+	DYNAMIC_LIB_PATH="target/x86_64-apple-darwin/release/libldk_node.dylib"
+	RES_DIR="$BINDINGS_DIR/$PROJECT_DIR/lib/src/main/resources/darwin-x86-64/"
+	mkdir -p $RES_DIR || exit 1
+	cp $DYNAMIC_LIB_PATH $RES_DIR || exit 1
 
-#rustup target add aarch64-apple-darwin
-#cargo build --target aarch64-apple-darwin || exit 1
-cargo build --release --features uniffi || exit 1
-$UNIFFI_BINDGEN_BIN generate bindings/ldk_node.udl --language kotlin -o "$TARGET_DIR" || exit 1
+	rustup target add aarch64-apple-darwin || exit 1
+	cargo build --release --target aarch64-apple-darwin --features uniffi || exit 1
+	DYNAMIC_LIB_PATH="target/aarch64-apple-darwin/release/libldk_node.dylib"
+	RES_DIR="$BINDINGS_DIR/$PROJECT_DIR/lib/src/main/resources/darwin-aarch64/"
+	mkdir -p $RES_DIR || exit 1
+	cp $DYNAMIC_LIB_PATH $RES_DIR || exit 1
+fi
 
 mkdir -p "$BINDINGS_DIR"/"$PROJECT_DIR"/lib/src/main/kotlin/"$PACKAGE_DIR" || exit 1
-mkdir -p "$BINDINGS_DIR"/"$PROJECT_DIR"/lib/src/main/resources/darwin-aarch64/ || exit 1
+$UNIFFI_BINDGEN_BIN generate bindings/ldk_node.udl --language kotlin -o "$TARGET_DIR" || exit 1
 
 cp "$TARGET_DIR"/"$PACKAGE_DIR"/ldk_node.kt "$BINDINGS_DIR"/"$PROJECT_DIR"/lib/src/main/kotlin/"$PACKAGE_DIR"/ || exit 1
-#cp ./target/aarch64-apple-darwin/debug/libldk_node.dylib "$BINDINGS_DIR"/"$PROJECT_DIR"/lib/src/main/resources/darwin-aarch64/libldk_node.dylib || exit 1
-cp $DYNAMIC_LIB_PATH "$BINDINGS_DIR"/"$PROJECT_DIR"/lib/src/main/resources/libldk_node.dylib || exit 1