add new image source to dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM kerstinsieren/alpine-phpfpm-nginx-baseimage:staging-latest
+FROM kerstinsieren/alpine-phpfpm-nginx-baseimage:php74-latest
 ENV TZ=Europe/Berlin
 COPY . .
 ONBUILD COPY composer.* ./

public/typo3conf/env-file-template

@@ -8,6 +8,7 @@ BE_DATABASE="db"
 BE_DATABASE_HOST=""
 BE_DATABASE_USER=""
 BE_DATABASE_PASSWORD=""
+BE_USER=""
 
 ## DKZ ##
 DKZ_LAYER="2020-09-02.1"