Lower default PoW and add export to build-release yarn call

config/default.json

@@ -4,7 +4,7 @@
   "cdnUrl": "random.snode",
   "contentProxyUrl": "",
   "localServerPort": "8081",
-  "defaultPoWDifficulty": "100",
+  "defaultPoWDifficulty": "1",
   "seedNodeList": [
     {
       "ip": "storage.testnetseed1.loki.network",

package.json

@@ -20,7 +20,7 @@
     "icon-gen": "electron-icon-maker --input=images/icon_1024.png --output=./build",
     "generate": "yarn icon-gen && yarn grunt",
     "build": "build  --config.extraMetadata.environment=$SIGNAL_ENV",
-    "build-release": "SIGNAL_ENV=production && npm run build -- --config.directories.output=release",
+    "build-release": "export SIGNAL_ENV=production && npm run build -- --config.directories.output=release",
     "sign-release": "node ts/updater/generateSignature.js",
     "build-module-protobuf": "pbjs --target static-module --wrap commonjs --out ts/protobuf/compiled.js protos/*.proto && pbts --out ts/protobuf/compiled.d.ts ts/protobuf/compiled.js",
     "clean-module-protobuf": "rm -f ts/protobuf/compiled.d.ts ts/protobuf/compiled.js",