DockerfileChoose base image and Install dependencies, create a Dockerfile:FROM postgres:12.8-bullseye ENV POSTGIS_MAJOR=3 ENV POSTGIS_VERSION=3.1.4+dfsg-1.pgdg100+1 RUN apt-get update \ && apt-cache showpkg postgres-$PG_MAJOR-postgis-$POSTGIS_MAJOR \ && apt-get install -y --no-install-recommends \ postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR \ postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR-scripts \ postgresql-$PG_MAJOR-pgrouting \ && rm -rf /var/lib/apt/list/* RUN m...