pg init script to configure db on start

- create users & dbs
- setup db permissions
- install extensions

hosts/common/optional/docker/postgres.nix

@@ -4,22 +4,55 @@
     backend = "docker";
     projects = {
       "db".settings.services."db".service = {
-        image = "postgres:16";
         restart = "unless-stopped";
+        build.context = "/nix/store";
+        build.dockerfile = builtins.baseNameOf "${pkgs.writeScript "pgDockerfile" ''
+            FROM postgres:16
+            # install packages
+            RUN apt-get update \
+                && apt-get install -y --no-install-recommends \
+                    postgresql-16-postgis \
+                && rm -rf /var/lib/apt/lists/*
+          ''}";
         environment = {
           POSTGRES_PASSWORD = "balls1234";
           POSTGRES_USER = "admin";
-          POSTGRES_DATABASE = "test_db";
+          POSTGRES_DB = "admin_db";
+          PGDATA = "/var/lib/postgresql/data/pgdata";
         };
         ports = [ "5432:5432" ];
         volumes = [
-          "/mnt/postgres/data:/var/lib/postgres/data"
-          "${pkgs.writeScript "load_extensions" ''
-            psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<EOF
-            create extension postgis;
-            select * FROM pg_extension;
-            EOF
-           ''}:/docker-entrypoint-initdb.d/"
+          "/mnt/postgres:/var/lib/postgresql/data"
+
+          # PG init script
+          "${pkgs.writeScript "init.sh" ''
+            #!/bin/bash
+
+            # Create additional databases
+            psql -v --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+            	create database bitcoin;
+            	create database osm;
+            EOSQL
+
+            # Create additional users
+            psql -v --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+            	create user gis;
+            	create user satoshi;
+            EOSQL
+
+            # Setup bitcoin db
+            psql -v --username "$POSTGRES_USER" --dbname "bitcoin" <<-EOSQL
+            	grant all privileges on database bitcoin to satoshi;
+            EOSQL
+
+            # Setup osm db
+            psql -v --username "$POSTGRES_USER" --dbname "osm" <<-EOSQL
+              grant all privileges on database osm to gis;
+              create extension if not exists postgis;
+              create extension if not exists hstore;
+            EOSQL
+
+           ''}:/docker-entrypoint-initdb.d/init.sh"
         ];
       };
     };