Add osx example build script

examples/AvaloniaCrossPlat/build-osx.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Find the absolute path of the script
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Check if version parameter is provided
+if [ "$#" -ne 1 ]; then
+    echo "Please provide a version number."
+    echo "Usage: ./build.sh version_number"
+    exit 1
+fi
+
+echo "Building Velopack"
+cd "$SCRIPT_DIR/../../src/Rust"
+cargo build
+cd "$SCRIPT_DIR/../.."
+dotnet build src/Velopack.Vpk/Velopack.Vpk.csproj
+cd "$SCRIPT_DIR"
+
+version="$1"
+releasesDir="$SCRIPT_DIR/releases"
+
+# Write to Const.cs
+echo "class Const { public const string RELEASES_DIR = @\"$releasesDir\"; } " > "$(dirname "$0")/Const.cs"
+echo "Const.cs file updated with releases directory ($releasesDir)."
+
+echo "Compiling AvaloniaCrossPlatTest with dotnet..."
+dotnet publish -c Release --no-self-contained -r osx-x64 -o "$(dirname "$0")/publish"
+
+echo "class Const { public const string RELEASES_DIR = @\"{REPLACE_ME}\"; } " > "$(dirname "$0")/Const.cs"
+echo "Const.cs file reset"
+
+echo "Building Velopack Release v$version"
+"$(dirname "$0")/../../build/Debug/net8.0/vpk" pack -u AvaloniaCrossPlatTest -v "$version" -o "$releasesDir" -r osx-x64 -e AvaloniaCrossPlat -p "$(dirname "$0")/publish" -c osx -i Velopack.icns