Dockerfile: downgrade npm to fix build

Dockerfile

@@ -1,17 +1,20 @@
-FROM node AS builder
+FROM node:14.14.0-alpine3.10 AS builder
+RUN npm --version
 WORKDIR /
 
 COPY ./src /src
 COPY ./package*.json ./
 COPY ./gulpfile.js ./
 COPY ./tsconfig.json ./
+COPY ./.eslintrc.json ./
 RUN npm install
-RUN npm install -g gulp
+
 RUN npm install gulp
+RUN npx eslint --config .eslintrc.json
+RUN npx gulp
 
-RUN gulp
 
-FROM node
+FROM node:14.14.0-alpine3.10
 COPY --from=builder ./dist ./dist
 COPY --from=builder ./package*.json ./
 RUN npm install --production

package-lock.json

@@ -5390,9 +5390,9 @@
       "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA=="
     },
     "object-path": {
-      "version": "0.11.4",
-      "resolved": "https://registry.npmjs.org/object-path/-/object-path-0.11.4.tgz",
-      "integrity": "sha1-NwrnUvvzfePqcKhhwju6iRVpGUk="
+      "version": "0.11.5",
+      "resolved": "https://registry.npmjs.org/object-path/-/object-path-0.11.5.tgz",
+      "integrity": "sha512-jgSbThcoR/s+XumvGMTMf81QVBmah+/Q7K7YduKeKVWL7N111unR2d6pZZarSk6kY/caeNxUDyxOvMWyzoU2eg=="
     },
     "object-visit": {
       "version": "1.0.1",