split build task into parallel and non-parallel versions

This allows FoundKey to be built on systems with 2GB or less RAM without swapping or running out of memory.

docs/install.md

@@ -70,6 +70,8 @@ Build foundkey with the following:
 
 `NODE_ENV=production yarn build`
 
+If your system has at least 4GB of RAM, run `NODE_ENV=production yarn build-parallel` to speed up build times.
+
 If you're still encountering errors about some modules, use node-gyp:
 
 1. `npx node-gyp configure`
@@ -182,6 +184,7 @@ Use git to pull in the latest changes and rerun the build and migration commands
 git pull
 git submodule update --init
 yarn install
+# Use build-parallel if your system has 4GB or more RAM and want faster builds
 NODE_ENV=production yarn build
 yarn migrate
 ```

package.json

@@ -10,7 +10,8 @@
 		"packages/*"
 	],
 	"scripts": {
-		"build": "yarn workspaces foreach --parallel --topological run build && yarn run gulp",
+		"build": "yarn workspaces foreach --topological run build && yarn run gulp",
+		"build-parallel": "yarn workspaces foreach --parallel --topological run build && yarn run gulp",
 		"start": "yarn workspace backend run start",
 		"start:test": "yarn workspace backend run start:test",
 		"init": "yarn migrate",