Use npm in Dockerfile rather than yarn

Dockerfile

@@ -4,12 +4,12 @@ LABEL authors="Lachlan Kermode <lk@forensic-architecture.org>"
 
 # Install app dependencies
 COPY package.json /www/package.json
-RUN cd /www; yarn
+RUN cd /www; npm install
 
 # Copy app source
 COPY . /www
 WORKDIR /www
-RUN yarn build
+RUN npm run build
 RUN mkdir -p data
 
 # set your port
@@ -17,4 +17,4 @@ ENV PORT 4040
 EXPOSE 4040
 
 # start command as per package.json
-CMD ["yarn", "start"]
+CMD ["npm", "start"]

package-lock.json

@@ -24,7 +24,7 @@
         "object-hash": "^1.3.0",
         "ramda": "^0.25.0",
         "resource-router-middleware": "^0.6.0",
-        "xlsx": "^0.17.0"
+        "xlsx": "^0.16.8"
       },
       "devDependencies": {
         "@babel/cli": "^7.1.2",
@@ -4531,11 +4531,6 @@
       "resolved": "https://registry.npmjs.org/fast-text-encoding/-/fast-text-encoding-1.0.3.tgz",
       "integrity": "sha512-dtm4QZH9nZtcDt8qJiOH9fcQd1NAgi+K1O2DbE6GG1PPCK/BWfOH3idCTRQ4ImXRUOyopDEgDEnVEE7Y/2Wrig=="
     },
-    "node_modules/fflate": {
-      "version": "0.3.11",
-      "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.3.11.tgz",
-      "integrity": "sha512-Rr5QlUeGN1mbOHlaqcSYMKVpPbgLy0AWT/W0EHxA6NGI12yO1jpoui2zBBvU2G824ltM6Ut8BFgfHSBGfkmS0A=="
-    },
     "node_modules/figures": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
@@ -9396,9 +9391,9 @@
       }
     },
     "node_modules/xlsx": {
-      "version": "0.17.0",
-      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.17.0.tgz",
-      "integrity": "sha512-bZ36FSACiAyjoldey1+7it50PMlDp1pcAJrZKcVZHzKd8BC/z6TQ/QAN8onuqcepifqSznR6uKnjPhaGt6ig9A==",
+      "version": "0.16.8",
+      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.16.8.tgz",
+      "integrity": "sha512-qWub4YCn0xLEGHI7WWhk6IJ73MDu7sPSJQImxN6/LiI8wsHi0hUhICEDbyqBT+jgFgORZxrii0HvhNSwBNAPoQ==",
       "dependencies": {
         "adler-32": "~1.2.0",
         "cfb": "^1.1.4",
@@ -9406,7 +9401,6 @@
         "commander": "~2.17.1",
         "crc-32": "~1.2.0",
         "exit-on-epipe": "~1.0.1",
-        "fflate": "^0.3.8",
         "ssf": "~0.11.2",
         "wmf": "~1.0.1",
         "word": "~0.3.0"
@@ -13057,11 +13051,6 @@
       "resolved": "https://registry.npmjs.org/fast-text-encoding/-/fast-text-encoding-1.0.3.tgz",
       "integrity": "sha512-dtm4QZH9nZtcDt8qJiOH9fcQd1NAgi+K1O2DbE6GG1PPCK/BWfOH3idCTRQ4ImXRUOyopDEgDEnVEE7Y/2Wrig=="
     },
-    "fflate": {
-      "version": "0.3.11",
-      "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.3.11.tgz",
-      "integrity": "sha512-Rr5QlUeGN1mbOHlaqcSYMKVpPbgLy0AWT/W0EHxA6NGI12yO1jpoui2zBBvU2G824ltM6Ut8BFgfHSBGfkmS0A=="
-    },
     "figures": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
@@ -16872,9 +16861,9 @@
       "dev": true
     },
     "xlsx": {
-      "version": "0.17.0",
-      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.17.0.tgz",
-      "integrity": "sha512-bZ36FSACiAyjoldey1+7it50PMlDp1pcAJrZKcVZHzKd8BC/z6TQ/QAN8onuqcepifqSznR6uKnjPhaGt6ig9A==",
+      "version": "0.16.8",
+      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.16.8.tgz",
+      "integrity": "sha512-qWub4YCn0xLEGHI7WWhk6IJ73MDu7sPSJQImxN6/LiI8wsHi0hUhICEDbyqBT+jgFgORZxrii0HvhNSwBNAPoQ==",
       "requires": {
         "adler-32": "~1.2.0",
         "cfb": "^1.1.4",
@@ -16882,7 +16871,6 @@
         "commander": "~2.17.1",
         "crc-32": "~1.2.0",
         "exit-on-epipe": "~1.0.1",
-        "fflate": "^0.3.8",
         "ssf": "~0.11.2",
         "wmf": "~1.0.1",
         "word": "~0.3.0"

package.json

@@ -34,7 +34,7 @@
     "object-hash": "^1.3.0",
     "ramda": "^0.25.0",
     "resource-router-middleware": "^0.6.0",
-    "xlsx": "^0.17.0"
+    "xlsx": "^0.16.8"
   },
   "devDependencies": {
     "@babel/cli": "^7.1.2",