contrib: use a zip archive for the MacOS sample app folder

Git cannot track empty folders, use an a zip archive for this.

contrib/release/macos/Liana.app/Contents/Info.plist

@@ -1,44 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd">
-<plist version="0.9">
-    <!-- Based on https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html#//apple_ref/doc/uid/10000123i-CH101-SW5 -->
-    <!-- See also https://github.com/bitcoin/bitcoin/blob/master/share/qt/Info.plist.in as an example. -->
-    <dict>
-        <key>CFBundleName</key>
-        <string>Liana</string>
-
-        <key>CFBundleDisplayName</key>
-        <string>Liana</string>
-
-        <key>CFBundleIdentifier</key>
-        <string>com.wizardsardine.liana</string>
-
-        <key>CFBundleVersion</key>
-        <string>VERSION_PLACEHOLDER</string>
-
-        <key>CFBundleShortVersionString</key>
-        <string>VERSION_PLACEHOLDER</string>
-
-        <key>CFBundlePackageType</key>
-        <string>APPL</string>
-
-        <key>CFBundleSignature</key>
-        <string>????</string>
-
-        <key>CFBundleExecutable</key>
-        <string>Liana</string>
-
-        <key>LSMinimumSystemVersion</key>
-        <string>10.15.0</string>
-
-        <key>CFBundleIconFile</key>
-        <string>Liana.icns</string>
-
-        <key>NSPrincipalClass</key>
-        <string>NSApplication</string>
-
-        <key>LSApplicationCategoryType</key>
-        <string>public.app-category.finance</string>
-
-    </dict>
-</plist>

contrib/release/macos/Liana.app/Contents/PkgInfo

@@ -1 +0,0 @@
-APPL????

contrib/release/release.sh

@@ -61,7 +61,7 @@ TARGET_DIR="$BUILD_DIR" ./contrib/reproducible/docker/docker-build.sh
     tar -czf "$MAC_ARCHIVE" "$MAC_DIR_NAME"
     cp "$MAC_ARCHIVE" "$RELEASE_DIR"
 
-    cp -r ../contrib/release/macos/Liana.app ./
+    unzip ../contrib/release/macos/Liana.app.zip ./
     sed -i "s/VERSION_PLACEHOLDER/$VERSION/g" ./Liana.app/Contents/Info.plist
     cp "$BUILD_DIR/gui/x86_64-apple-darwin/release/liana-gui" ./Liana.app/Contents/MacOS/Liana
     zip -ry Liana-noncodesigned.zip Liana.app