Add prepare script to allow CI to skip build

.ci/azure-pipelines-build.yml

@@ -21,15 +21,15 @@ jobs:
       versionSpec: '12.x'
 
   - task: Cache@2
-    displayName: 'Check Cache'
+    displayName: 'Cache node_modules'
     inputs:
       key: 'yarn | yarn.lock'
       path: 'node_modules'
-      cacheHitVar: CACHE_RESTORED
 
   - script: 'yarn install --frozen-lockfile'
     displayName: 'Install Dependencies'
-    condition: ne(variables.CACHE_RESTORED, 'true')
+    env:
+      SKIP_PREPARE: 'true'
 
   - script: 'yarn build:development'
     displayName: 'Build Development'

.ci/azure-pipelines-lint.yml

@@ -12,15 +12,15 @@ jobs:
       versionSpec: '12.x'
 
   - task: Cache@2
-    displayName: 'Check Cache'
+    displayName: 'Cache node_modules'
     inputs:
       key: 'yarn | yarn.lock'
       path: 'node_modules'
-      cacheHitVar: CACHE_RESTORED
 
   - script: 'yarn install --frozen-lockfile'
     displayName: 'Install Dependencies'
-    condition: ne(variables.CACHE_RESTORED, 'true')
+    env:
+      SKIP_PREPARE: 'true'
 
   - script: 'yarn run lint --quiet'
     displayName: 'Run ESLint'

package.json

@@ -394,7 +394,7 @@
   "scripts": {
     "start": "yarn serve",
     "serve": "gulp serve --development",
-    "prepare": "gulp --production",
+    "prepare": "./scripts/prepare.sh",
     "build:development": "gulp --development",
     "build:production": "gulp --production",
     "build:standalone": "gulp standalone --development",

scripts/prepare.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+if [ -z "${SKIP_PREPARE}" ]; then
+    npx gulp --production
+fi