chore(): add example env file

env

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+# network
+DESECSTACK_IPV6_SUBNET=bade:affe:dead:beef:deec:/80
+DESECSTACK_IPV6_ADDRESS=bade:affe:dead:beef:deec:0642:ac10:0080
+
+# certificates
+DESECSTACK_CERT_FOLDER=./certs
+
+# API-related
+DESECSTACK_API_SECRETKEY=
+DESECSTACK_DBAPI_PASSWORD_root=
+DESECSTACK_DBAPI_PASSWORD_desec=
+
+# nslord-related
+DESECSTACK_DBLORD_PASSWORD_root=
+DESECSTACK_DBLORD_PASSWORD_pdns=
+DESECSTACK_DBLORD_PASSWORD_poweradmin=
+DESECSTACK_NSLORD_APIKEY=
+
+# nsmaster-related
+DESECSTACK_DBMASTER_PASSWORD_root=
+DESECSTACK_DBMASTER_PASSWORD_pdns=
+DESECSTACK_DBMASTER_PASSWORD_ns1replication=
+DESECSTACK_DBMASTER_SUBJECT_ns1replication=ns1.desec.io
+DESECSTACK_DBMASTER_PASSWORD_ns2replication=
+DESECSTACK_DBMASTER_SUBJECT_ns2replication=ns2.desec.io
+
+# devadmin-related
+DESECSTACK_DEVADMIN_PASSWORD_poweradmin=
+DESECSTACK_DEVADMIN_SESSIONKEY_poweradmin=