How to create postgis extension for postgresql in docker?

Question

I'm getting errors when trying to create postgis extensions.

Here is what my dockerfile looks like.

    from postgres
RUN apt-get update && apt-get install postgis -y
ADD /create_postgis_extension.sh /docker-entrypoint-initdb.d/

create.bla-bla..sh

#!/bin/sh
POSTGRES="gosu postgres postgres"

$POSTGRES --single -E <<EOSQL
CREATE EXTENSION postgis;
CREATE EXTENSION postgis_topology;
EOSQL

And here is the error when running the image

backend> statement: CREATE EXTENSION postgis;

ERROR: type addbandarg[] does not exist STATEMENT: CREATE EXTENSION postgis;

backend> statement: CREATE EXTENSION postgis_topology;

backend> ERROR: required extension "postgis" is not installed

I'm doing something wrong obviously, but I don't know what. Why is postgis in not installed if I've installed postgis with apt-get.

Answer 1

---DOCKERFILE

FROM postgres:12.4

RUN apt-get update \
    && apt-get install wget -y \
    && apt-get install postgresql-12-postgis-3 -y \
    && apt-get install postgis -y

COPY ./db.sql /docker-entrypoint-initdb.d/

--- db.sql (in this same folder)

CREATE EXTENSION postgis;