Add publish scripts, Gitea Actions workflow, and pre-built binary downloads to README

scripts/publish-all.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+PROJECT="ADBulkTool.csproj"
+CONFIG="Release"
+VERSION="${1:-1.0.0}"
+
+publish() {
+    local rid="$1"
+    local suffix="$2"
+    echo "Publishing for $rid..."
+    dotnet publish "$PROJECT" \
+        -c "$CONFIG" \
+        -r "$rid" \
+        --self-contained true \
+        -p:PublishSingleFile=true \
+        -p:IncludeNativeLibrariesForSelfExtract=true \
+        -p:Version="$VERSION" \
+        -o "publish/$suffix"
+    echo "  -> publish/$suffix"
+}
+
+publish "win-x64"   "windows-x64"
+publish "linux-x64" "linux-x64"
+publish "osx-x64"   "macos-x64"
+publish "osx-arm64" "macos-arm64"
+
+echo ""
+echo "All builds complete. Artifacts are in ./publish/"
+ls -lh publish/*/