feat: predefined database test creation

Author: vwency

Dockerfile

@@ -1,5 +1,6 @@
 FROM postgres:16.6
 
+ENV DATABASE_NAME=test
 COPY create-db.sh /docker-entrypoint-initdb.d/create-db.sh
 RUN chmod +x /docker-entrypoint-initdb.d/create-db.sh
 

README.md

@@ -1 +1,13 @@
-### postgres image 
+### postgres image 
+
+### Start (custom)
+
+```
+
+```
+
+### Start (powershell)
+
+```
+
+```