Add node_modules mount to improve caching times

This commit adds `node_modules` to dagger run commands so cached builds have
similar speed times as running commands locally directly through yarn
<script>

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

pkg/universe.dagger.io/examples/todoapp/netlify.cue

@@ -8,6 +8,15 @@ import (
 	"universe.dagger.io/netlify"
 )
 
+nodeModulesMount: "/src/node_modules": dagger.#Mount & {
+	dest:     "/src/node_modules"
+	type:     "cache"
+	contents: dagger.#CacheDir & {
+		id: "todoapp-modules-cache"
+	}
+
+}
+
 dagger.#Plan & {
 	client: {
 		filesystem: {
@@ -46,13 +55,16 @@ dagger.#Plan & {
 				// install yarn dependencies
 				bash.#Run & {
 					workdir: "/src"
-					mounts: "/cache/yarn": dagger.#Mount & {
+					mounts: {
+						"/cache/yarn": dagger.#Mount & {
 							dest:     "/cache/yarn"
 							type:     "cache"
 							contents: dagger.#CacheDir & {
 								id: "todoapp-yarn-cache"
 							}
 						}
+						nodeModulesMount
+					}
 					script: contents: #"""
 						yarn config set cache-folder /cache/yarn
 						yarn install
@@ -64,6 +76,7 @@ dagger.#Plan & {
 		test: bash.#Run & {
 			input:   deps.output
 			workdir: "/src"
+			mounts:  nodeModulesMount
 			script: contents: #"""
 				yarn run test
 				"""#
@@ -72,6 +85,7 @@ dagger.#Plan & {
 		build: {
 			run: bash.#Run & {
 				input:   test.output
+				mounts:  nodeModulesMount
 				workdir: "/src"
 				script: contents: #"""
 					yarn run build