Replace release.mk by release scripts

Since commit 2687d20280, the Makefile
named release.mk stopped handling dependencies between recipes, because
they have to be executed separately (from different Github Actions
jobs).

Using a Makefile no longer provides any real benefit. Replace it by
several individual release scripts for simplicity and readability.

Refs #5306 <https://github.com/Genymobile/scrcpy/pull/5306>
PR #5515 <https://github.com/Genymobile/scrcpy/pull/5515>

release/package_client.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+set -ex
+cd "$(dirname ${BASH_SOURCE[0]})"
+. build_common
+cd .. # root project dir
+
+if [[ $# != 1 ]]
+then
+    # <target_name>: for example win64
+    echo "Syntax: $0 <target>" >&2
+    exit 1
+
+fi
+
+BUILD_DIR="$WORK_DIR/build-$1"
+ARCHIVE_DIR="$BUILD_DIR/release-archive"
+TARGET="scrcpy-$1-$VERSION"
+
+rm -rf "$ARCHIVE_DIR/$TARGET"
+mkdir -p "$ARCHIVE_DIR/$TARGET"
+
+cp -r "$BUILD_DIR/dist/." "$ARCHIVE_DIR/$TARGET/"
+cp "$WORK_DIR/build-server/server/scrcpy-server" "$ARCHIVE_DIR/$TARGET/"
+
+mkdir -p "$OUTPUT_DIR"
+
+cd "$ARCHIVE_DIR"
+rm -f "$OUTPUT_DIR/$TARGET.zip"
+zip -r "$OUTPUT_DIR/$TARGET.zip" "$TARGET"
+rm -rf "$TARGET"
+cd -
+echo "Generated '$OUTPUT_DIR/$TARGET.zip'"