chore: add "make webpack" as a Concourse build step (#2070)

We also have to add the generated directory to the final package.

Change-Type: patch
Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

.resinci.json

@@ -21,6 +21,11 @@
       "appId": "io.resin.etcher",
       "copyright": "Copyright 2016 Resinio Ltd",
       "productName": "Etcher",
+      "files": [
+        "!lib/gui/app",
+        "lib/gui/app/index.html",
+        "generated"
+      ],
       "mac": {
         "category": "public.app-category.developer-tools"
       },

package.json

@@ -24,6 +24,7 @@
     "configure": "node-gyp configure",
     "build": "node-gyp build",
     "install": "node-gyp rebuild",
+    "concourse-build-electron": "make webpack",
     "concourse-test": "npm test",
     "concourse-test-electron": "npm test",
     "concourse-test-node-cli": "make lint test-cli sanity-checks"