Redo docker build system with buildkit+multi-stage and cache pio packages (#2338)

docker/hassio-rootfs/etc/services.d/nginx/finish

@@ -0,0 +1,9 @@
+#!/usr/bin/execlineb -S0
+# ==============================================================================
+# Community Hass.io Add-ons: ESPHome
+# Take down the S6 supervision tree when NGINX fails
+# ==============================================================================
+if -n { s6-test $# -ne 0 }
+if -n { s6-test ${1} -eq 256 }
+
+s6-svscanctl -t /var/run/s6/services

docker/hassio-rootfs/etc/services.d/nginx/run

@@ -0,0 +1,14 @@
+#!/usr/bin/with-contenv bashio
+# ==============================================================================
+# Community Hass.io Add-ons: ESPHome
+# Runs the NGINX proxy
+# ==============================================================================
+
+bashio::log.info "Waiting for dashboard to come up..."
+
+while [[ ! -S /var/run/esphome.sock ]]; do
+  sleep 0.5
+done
+
+bashio::log.info "Starting NGINX..."
+exec nginx