fix: build the Docker image and update the doc

Also, copy patches/ into the build stage image, so patch-package
can apply the patch properly.

Fix italia#311.

.dockerignore

@@ -1,3 +1,3 @@
 .git
 node_modules
-build
+dist

Dockerfile

@@ -1,13 +1,14 @@
-# Stage 0, "build-stage".
-FROM node:lts as build-stage
+FROM docker.io/node:18 as build-stage
+
 WORKDIR /app
-COPY package*.json /app/
 
-# First install deps, then copy app and build.
+RUN apt-get update \
+    && apt-get -y --no-install-recommends install golang-go=2:1.19~1 golang-src=2:1.19~1
+
+COPY . /app
+
 RUN npm ci
-COPY ./ /app/
 RUN npm run build
 
-# Stage 1, "prod-stage".
-FROM nginx:1
+FROM docker.io/nginx:1
 COPY --from=build-stage /app/dist/ /usr/share/nginx/html

README.md

@@ -68,7 +68,7 @@ docker build -t publiccode-editor .
 you can build a Docker image. Subsequently, by running:
 
 ```console
-docker run -p 8080:8080 publiccode-editor
+docker run -p 8080:80 publiccode-editor
 ```
 
 you can run the Docker container and see the results at [`http://localhost:8080`](http://localhost:8080).