migrate to pi-hole v6 and alpine container image

example.pihole.env

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+# Settings that are set via environment variables effectively become read-only, 
+# meaning that you will not be able to change them in the web interface or CLI. 
+# This is to ensure a "single source of truth" on the config. If you later unset 
+# an environment variable, then FTL will revert to the default value for that setting.
+# You can find all settings under /etc/pihole/pihole.toml.
+
+# Set your timezone to make sure logs rotate at local midnight instead of at UTC midnight.
+# List of timezones https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+TZ=Europe/Berlin
+
+# Set your admin password for https://pi.hole/admin.
+FTLCONF_webserver_api_password=Super_Secure_Password
+
+# If using Docker's default `bridge` network setting the dns listening mode should be set to 'all'
+FTLCONF_dns_listeningMode=all
+
+# Upstream DNS server(s) for Pi-hole to forward queries to, seperated by a semicolon
+# (supports non-standard ports with #[port number]) e.g 127.0.0.1#5053;8.8.8.8;8.8.4.4
+# Hardcoded to our Unbound server
+FTLCONF_dns_upstreams=127.0.0.1#5335
+
+# Validate DNS replies using DNSSEC?                                              
+FTLCONF_dns_dnssec = true
+
+# On which domain is the web interface served? 
+# Default value is pi.hole
+# FTLCONF_webserver_domain=pihole-01.int.exmample.com
+
+# Theme used by the Pi-hole web interface
+# default-dark | default-darker | default-light | high-contrast | high-contrast-dark | default-auto | lcars
+FTLCONF_webserver_interface_theme=default-dark
+
+# Which temperature unit should be used for temperatures processed by FTL?      
+# C | F | K
+FTLCONF_webserver_api_temp_unit=C