chore: import base docker images from the Docker repo

.github/workflows/base-images.yml

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+name: Publish base Docker images
+
+on: 
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        nodejs: [10, 12, 14]
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v1 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      -
+        name: Publish thumbsup/runtime
+        uses: docker/build-push-action@v2
+        with:
+          context: docker
+          file: ./docker/Dockerfile.runtime
+          build-args: NODE_VERSION=${{ matrix.nodejs }}
+          platforms: linux/amd64,linux/arm64
+          tags: ghcr.io/thumbsup/runtime:node-${{ matrix.nodejs }}
+          push: true
+      -
+        name: Publish thumbsup/build
+        uses: docker/build-push-action@v2
+        with:
+          context: docker
+          file: ./docker/Dockerfile.build
+          build-args: NODE_VERSION=${{ matrix.nodejs }}
+          platforms: linux/amd64,linux/arm64
+          tags: ghcr.io/thumbsup/build:node-${{ matrix.nodejs }}
+          push: true

docker/Dockerfile.build

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+# -------------------------------------------------
+# This Docker image is used to speed up the builds
+# -------------------------------------------------
+
+ARG NODE_VERSION
+
+# Node.js + runtime dependencies
+FROM ghcr.io/thumbsup/runtime:node-${NODE_VERSION}
+
+# Metadata
+LABEL org.opencontainers.image.source https://github.com/thumbsup/thumbsup
+
+# Standard build dependencies for npm install
+RUN apk add --no-cache git make g++ python bash
+
+# Pre-install expensive dependencies
+WORKDIR /app
+RUN npm init -y
+RUN npm install better-sqlite3

docker/Dockerfile.runtime

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+# -------------------------------------------------
+# This Docker image contains all the typical
+# runtime dependencies for thumbsup, including
+# exiftool, imagemagick, ffmpeg, gifsicle...
+# -------------------------------------------------
+
+ARG NODE_VERSION
+FROM node:${NODE_VERSION}-alpine as base
+
+# Metadata
+LABEL org.opencontainers.image.source https://github.com/thumbsup/thumbsup
+
+# Add libraries
+RUN apk add --update --no-cache libgomp zlib libpng libjpeg-turbo libwebp tiff lcms2 x265 libde265 libheif
+
+# Add external programs
+RUN apk add --update --no-cache ffmpeg imagemagick graphicsmagick exiftool gifsicle zip