Add build script scaffold for swift munki (#1234)

.gitignore

@@ -12,3 +12,6 @@ code/apps/munkishim/build/
 # ignore any pkgs build by tool scripts
 munkitools*.pkg
 Python.framework
+
+# ignore paths related to building swift munki
+code/cli/munki/build/

code/tools/build_swift_munki.zsh

@@ -0,0 +1,18 @@
+#!/bin/zsh
+
+check_exit_code() {
+    if [ "$1" != "0" ]; then
+        echo "$2: $1" 1>&2
+        exit 1
+    fi
+}
+
+SWIFT_MUNKI_DIR="./cli/munki"
+
+# Build makecatalogs
+xcodebuild -project "$SWIFT_MUNKI_DIR/munki.xcodeproj" -scheme makecatalogs build
+check_exit_code "$?" "Error building makecatalogs"
+
+# Build makepkginfo
+xcodebuild -project "$SWIFT_MUNKI_DIR/munki.xcodeproj" -scheme makepkginfo build
+check_exit_code "$?" "Error building makepkginfo"