chore: Fix CI; update package-lock.json to new format.

.dockerignore

@@ -0,0 +1 @@
+/.git

.github/workflows/ci.yaml

@@ -1,19 +1,25 @@
----
+name: ci
+
+# Run on push and once a week to keep the images from bitrotting and to
+# identify issues while no commits are being pushed.
 on:
-  push:
-    branches: [master]
   pull_request:
     branches: [master]
   schedule:
-  - cron: '0 4 * * *' # Run at 04:00 every day.
+    - cron: "52 2 * * 0"
+
+# Cancel old PR builds when pushing new commits.
+concurrency:
+  group: build-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 13.x]
+        node-version: [12.x, 13.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -43,3 +49,13 @@ jobs:
     - run: npm run report-coverage
     - run: npm run format && git diff --exit-code
       if: ${{ matrix.node-version == '13.x' }}
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Docker Build
+        uses: docker/build-push-action@v2
+        with:
+          tags: toxchat/js-toxcore-c:latest

Dockerfile

@@ -0,0 +1,34 @@
+FROM ubuntu:22.04
+
+RUN apt-get update && \
+ DEBIAN_FRONTEND="noninteractive" apt-get install -y --no-install-recommends \
+ ca-certificates \
+ build-essential \
+ cmake \
+ git \
+ libopus-dev \
+ libsodium-dev \
+ libvpx-dev \
+ ninja-build \
+ nodejs \
+ npm \
+ pkg-config \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /work/c-toxcore
+RUN git clone --depth=1 --recurse-submodules --shallow-submodules --branch=master https://github.com/TokTok/c-toxcore.git /work/c-toxcore
+RUN cmake -B_build -H. -GNinja
+RUN cmake --build _build --target install
+
+WORKDIR /work/js-toxcore-c
+COPY . /work/js-toxcore-c/
+ENV LD_LIBRARY_PATH=/usr/local/lib
+RUN ls -l /usr/local/lib/libtoxcore.so
+RUN npm install
+RUN npm run doc
+RUN npm run test
+RUN npm run coverage
+RUN npm run format
+COPY . /work/js-toxcore-c.orig/
+#RUN diff -ru /work/js-toxcore-c /work/js-toxcore-c.orig