Inject secret key at build time

package.json

@@ -28,6 +28,7 @@
     "invariant": "^2.2.2",
     "isomorphic-fetch": "^2.2.1",
     "jest": "^22.4.4",
+    "node-forge": "^0.7.6",
     "rollup": "^1.0.0",
     "rollup-plugin-babel": "^4.2.0",
     "rollup-plugin-commonjs": "^9.2.0",
@@ -37,5 +38,10 @@
     "rollup-plugin-size-snapshot": "^0.7.0",
     "rollup-plugin-url": "^2.1.0",
     "supertest": "^3.0.0"
+  },
+  "dependencies": {
+    "date-fns": "^1.30.1",
+    "pretty-bytes": "^5.1.0",
+    "sort-by": "^1.2.0"
   }
 }