EZP-30915: Fix for node version (ezsystems#450)

https://jira.ez.no/browse/EZP-30915

.platform.app.yaml

@@ -96,6 +96,13 @@ hooks:
     build: |
         set -e
 
+        unset NPM_CONFIG_PREFIX
+        curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | dash
+        export NVM_DIR="$HOME/.nvm"
+        [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+        nvm current
+        nvm install 10.15.3
+
         # Configure GITHUB token if set. For use if you have own private repos, or to avoid API rate limits.
         if [ -n "$GITHUB_TOKEN" ]; then
             composer config github-oauth.github.com $GITHUB_TOKEN
@@ -108,6 +115,10 @@ hooks:
     # Note: Http traffic is paused while this is running, so for prod code this should finish as fast as possible, < 30s
     deploy: |
         set -e
+
+        unset NPM_CONFIG_PREFIX
+        command -v nvm && nvm use 10.15.3
+
         # Mainly relevant for eZ Platform demo usage, for own setup adapt this or remove and rely on migrations.
         if [ ! -f web/var/.platform.installed ]; then
             # To workaround issues with p.sh Varnish we clear container cache & temporary set Symfony Proxy

package.json

@@ -1,7 +1,7 @@
 {
   "devDependencies": {
     "@babel/preset-react": "^7.0.0",
-    "@symfony/webpack-encore": "^0.22.4",
+    "@symfony/webpack-encore": "^0.28.0",
     "node-sass": "^4.11.0",
     "sass-loader": "^7.0.1"
   }