feat(zabbixserver): Add Zabbix setup instructions

zabbixserver/env/fqdn_contaxt.env.example

@@ -0,0 +1,27 @@
+# This file is maintained by remco and populated with data from HashiCorp
+# Vault. Changes not done in Vault will be reverted when file gets rendered.
+
+CTX=
+PHP_TZ=
+POSTGRES_DB=
+POSTGRES_PASSWORD=
+POSTGRES_USER=
+VAULT_TOKEN=
+ZBX_DB_USERNAME_PW=
+ZBX_DB_USERNAME_RO=
+ZBX_PGSQL_TLS_CA_CERT_FILE=
+ZBX_PGSQL_TLS_CERT_FILE=
+ZBX_PGSQL_TLS_KEY_FILE=
+ZBX_SERVER_HOST=
+ZBX_SERVER_NAME=
+ZBX_SERVER_TLS_CA_CERT_FILE=
+ZBX_SERVER_TLS_CERT_FILE=
+ZBX_SERVER_TLS_KEY_FILE=
+ZBX_VAULTDBPATH=
+ZBX_VAULTURL=
+ZBX_WEBNGINX_EXPOSED_HTTPS_PORT=
+ZBX_WEBNGINX_EXPOSED_HTTP_PORT=
+ZBX_WEBNGINX_TLS_CERT_FULLCHAIN_FILE=
+ZBX_WEBNGINX_TLS_KEY_FILE=
+# When needed for temporary debugging
+# ZBX_DEBUGLEVEL=4