add heimdall

heimdall/root/etc/cont-init.d/00-ha-env

@@ -0,0 +1,5 @@
+#!/usr/bin/with-contenv bashio
+
+for k in $(bashio::jq "${__BASHIO_ADDON_CONFIG}" 'keys | .[]'); do
+    printf "$(bashio::config $k)" > /var/run/s6/container_environment/$k
+done

heimdall/root/etc/cont-init.d/20-folders

@@ -0,0 +1,7 @@
+#!/usr/bin/with-contenv bash
+
+if [ ! -d /config/heimdall ]; then
+  echo "Creating /config/heimdall"
+  mkdir -p /config/heimdall
+  chown -R abc:abc /config/heimdall
+fi