Update Dockerfile

Dockerfile

-FROM rhel8/postgresql-12 as pg
+FROM postgres:13 as pg
 
-LABEL maintainer="David Bitner / Remi Cresson"
+LABEL maintainer="David Bitner"
 
 ENV POSTGIS_MAJOR 3
 ENV PGUSER postgres
@@ -53,12 +53,3 @@ RUN pip3 install -e /opt/src/pypgstac[psycopg]
 ENV PYTHONPATH=/opt/src/pypgstac:${PYTHONPATH}
 
 WORKDIR /opt/src
-
-
-ENV POSTGRES_USER=username
-ENV POSTGRES_PASSWORD=password
-ENV POSTGRES_DB=postgis
-ENV PGUSER=username
-ENV PGPASSWORD=password
-ENV PGHOST=localhost
-ENV PGDATABASE=postgis