chore: add Docker image for docs and Uncloud Compose deployment (dogfooding!)

Makefile

@@ -1,5 +1,6 @@
 CORROSION_IMAGE ?= ghcr.io/psviderski/corrosion:latest
 UCIND_IMAGE ?= ghcr.io/psviderski/ucind:latest
+DOCS_IMAGE ?= ghcr.io/psviderski/uncloud-docs:latest
 
 update-dev:
 	GOOS=linux GOARCH=amd64 go build -o uncloudd-linux-amd64 ./cmd/uncloudd && \
@@ -68,3 +69,7 @@ test:
 .PHONY: vet
 vet:
 	go vet ./...
+
+.PHONY: docs-image-push
+docs-image:
+	docker buildx build --push --platform linux/amd64,linux/arm64 -t "$(DOCS_IMAGE)" ./docs

docs/.dockerignore

@@ -0,0 +1,14 @@
+# Ignore everything and use an allowlist of what is allowed to not package any secrets by accident.
+*
+
+# Allow files and directories.
+!docs/
+!src/
+!static/
+!pkg/
+!Caddyfile
+!*.js
+!*.json
+
+# Ignore unnecessary files inside allowed directories.
+**/.DS_Store

docs/Caddyfile

@@ -0,0 +1,9 @@
+{
+    admin off
+}
+
+:8000 {
+    root * /usr/share/caddy
+    file_server
+    try_files {path} /index.html
+}

docs/Dockerfile

@@ -0,0 +1,27 @@
+# Stage 1: Base image.
+## Start with a base image containing NodeJS so we can build Docusaurus.
+FROM node:lts-alpine AS base
+## Disable colour output from yarn to make logs easier to read.
+ENV FORCE_COLOR=0
+## Enable corepack.
+RUN corepack enable
+## Set the working directory to `/opt/docusaurus`.
+WORKDIR /opt/docusaurus
+
+# Stage 2: Production build.
+FROM base AS prod
+## Set the working directory to `/opt/docusaurus`.
+WORKDIR /opt/docusaurus
+## Copy over the source code.
+COPY . /opt/docusaurus/
+## Install dependencies with `--immutable` to ensure reproducibility.
+RUN npm ci
+## Build the static site.
+RUN npm run build
+
+# Stage 3: Serve static site with Caddy.
+FROM caddy:2.10.0-alpine AS caddy
+## Copy the Caddyfile.
+COPY ./Caddyfile /etc/caddy/Caddyfile
+## Copy the Docusaurus build output.
+COPY --from=prod /opt/docusaurus/build /usr/share/caddy

docs/compose.yaml

@@ -0,0 +1,7 @@
+services:
+  uncloud-docs:
+    image: ghcr.io/psviderski/uncloud-docs:latest
+    pull_policy: always
+    user: nobody
+    x-ports:
+      - docs.uncloud.run:8000/https