feat: tidy docker setup

Tidy the docker setup and include a Github Action
for publishing docker containers to DockerHub and
Github Container Registry.

Also add a small README file with docker hosting instructions.

docker/Dockerfile

@@ -32,6 +32,7 @@ RUN apk add --no-cache libc6-compat
 RUN apk add --no-cache jq
 # Required for node_modules/aws-crt
 RUN apk add --no-cache make cmake g++
+
 WORKDIR /app
 
 # Disable husky from installing hooks
@@ -80,6 +81,7 @@ WORKDIR /app
 # Don't run production as root
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs
+
 USER nextjs
 
 COPY --from=installer /app/apps/web/next.config.js .
@@ -91,4 +93,7 @@ COPY --from=installer --chown=nextjs:nodejs /app/apps/web/.next/standalone ./
 COPY --from=installer --chown=nextjs:nodejs /app/apps/web/.next/static ./apps/web/.next/static
 COPY --from=installer --chown=nextjs:nodejs /app/apps/web/public ./apps/web/public
 
-CMD node apps/web/server.js
+# Get the start script from docker/start.sh
+COPY --chown=nextjs:nodejs /docker/start.sh .
+
+CMD start.sh