Auto-commit after successful build: update app gameplay/UI, improve build setup

Changed files:\nCrossCompileGitForAndroid.sh
SetupBuildEnvironment.sh
app/build.gradle.kts
app/src/main/assets/native-git/arm64-v8a/git
app/src/main/java/com/kawomi/githugandroid/GitRuntime.kt

CrossCompileGitForAndroid.sh

@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$SCRIPT_DIR"
+SDK_DIR="$PROJECT_DIR/android-sdk"
+NDK_DIR="$SDK_DIR/ndk/27.2.12479018"
+TOOLBIN="$NDK_DIR/toolchains/llvm/prebuilt/linux-x86_64/bin"
+TMP_DIR="$PROJECT_DIR/.tmp-android-build"
+GIT_SRC_DIR="$TMP_DIR/git-src"
+ASSET_DIR="$PROJECT_DIR/app/src/main/assets/native-git/arm64-v8a"
+
+log() {
+  printf '\n[%s] %s\n' "cross-compile" "$1"
+}
+
+require_path() {
+  if [ ! -e "$1" ]; then
+    echo "Required path not found: $1" >&2
+    exit 1
+  fi
+}
+
+require_tool() {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    echo "Missing required tool: $1" >&2
+    exit 1
+  fi
+}
+
+main() {
+  require_tool git
+  require_tool make
+  require_tool perl
+  require_tool clang
+  require_tool pkg-config
+  require_tool readelf
+
+  require_path "$NDK_DIR"
+  require_path "$TOOLBIN/aarch64-linux-android24-clang"
+
+  mkdir -p "$TMP_DIR"
+
+  if [ ! -d "$GIT_SRC_DIR/.git" ]; then
+    log "Cloning Git source"
+    git clone --depth 1 https://github.com/git/git.git "$GIT_SRC_DIR"
+  else
+    log "Using existing Git source checkout"
+  fi
+
+  export PATH="$TOOLBIN:$PATH"
+
+  log "Building native Git for Android arm64-v8a"
+  cd "$GIT_SRC_DIR"
+  make clean >/dev/null 2>&1 || true
+  make -j4 \
+    uname_S=Android \
+    uname_O=Android \
+    NO_PTHREADS=YesPlease \
+    NO_OPENSSL=YesPlease \
+    NO_CURL=YesPlease \
+    NO_EXPAT=YesPlease \
+    NO_GETTEXT=YesPlease \
+    NO_TCLTK=YesPlease \
+    NO_PERL=YesPlease \
+    NO_PYTHON=YesPlease \
+    NO_INSTALL_HARDLINKS=YesPlease \
+    NO_ICONV=YesPlease \
+    NO_LIBGEN_H=YesPlease \
+    NO_REGEX=NeedsStartEnd \
+    HAVE_ALLOCA_H=YesPlease \
+    HAVE_PATHS_H=YesPlease \
+    HAVE_DEV_TTY=YesPlease \
+    HAVE_CLOCK_GETTIME=YesPlease \
+    HAVE_CLOCK_MONOTONIC=YesPlease \
+    HAVE_GETDELIM=YesPlease \
+    FREAD_READS_DIRECTORIES=UnfortunatelyYes \
+    CSPRNG_METHOD= \
+    CC=aarch64-linux-android24-clang \
+    AR=llvm-ar \
+    RANLIB=llvm-ranlib \
+    STRIP=llvm-strip \
+    git
+
+  log "Validating the produced binary"
+  file git
+  readelf -h git | sed -n '1,20p'
+  readelf -d git | sed -n '1,40p'
+
+  mkdir -p "$ASSET_DIR"
+  llvm-strip -s git -o "$ASSET_DIR/git"
+  chmod 755 "$ASSET_DIR/git"
+
+  log "Bundled stripped binary at: $ASSET_DIR/git"
+  ls -lh "$ASSET_DIR/git"
+}
+
+main "$@"