How do I create a template from the following Docker files?

FROM postgres:16-alpine3.19

RUN apk -U add --no-cache \
  alpine-sdk \ 
  curl-dev \
  clang15 \
  llvm15 \
  perl

RUN git clone https://github.com/supabase/pg_net.git

RUN cd pg_net && \
  make && make install

RUN cd / && \
  rm -rf pg_net && \
  apk cache clean

RUN echo '#!/bin/bash' > /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'set -e' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'CREATE USER postgres;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'ALTER ROLE postgres SUPERUSER;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'CREATE EXTENSION IF NOT EXISTS pg_net;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'EOSQL' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  chmod +x /docker-entrypoint-initdb.d/00-pg-net.sh

FROM postgres:16-alpine3.19

RUN apk -U add --no-cache \
  alpine-sdk \ 
  curl-dev \
  clang15 \
  llvm15 \
  perl

RUN git clone https://github.com/supabase/pg_net.git

RUN cd pg_net && \
  make && make install

RUN cd / && \
  rm -rf pg_net && \
  apk cache clean

RUN echo '#!/bin/bash' > /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'set -e' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'CREATE USER postgres;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'ALTER ROLE postgres SUPERUSER;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'CREATE EXTENSION IF NOT EXISTS pg_net;' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  echo 'EOSQL' >> /docker-entrypoint-initdb.d/00-pg-net.sh && \
  chmod +x /docker-entrypoint-initdb.d/00-pg-net.sh

version: '3.7'

services:
  postgres:
    build:
      context: .
    image: postgresql:16-alpine3.19-pg_net
    ports:
      - '5432:5432'
    command: postgres -c shared_preload_libraries=pg_net -c pg_net.database_name=${POSTGRES_DB} -c max_connections=200
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    volumes:
      - postgres_data:/var/lib/postgresql/data 
    restart: unless-stopped

volumes:
  postgres_data:

version: '3.7'

services:
  postgres:
    build:
      context: .
    image: postgresql:16-alpine3.19-pg_net
    ports:
      - '5432:5432'
    command: postgres -c shared_preload_libraries=pg_net -c pg_net.database_name=${POSTGRES_DB} -c max_connections=200
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    volumes:
      - postgres_data:/var/lib/postgresql/data 
    restart: unless-stopped

volumes:
  postgres_data: