xFuture603

### upgrade your dockerized postgresql version in docker container

Background: I've wanted to upgrade the Postgresql version of one of my images from version 11 to version 14.

1. create a temp directory with some space left on the disk
```bash
mkdir $directory
```

2. create a Dockerfile with 2 postgres versions in it. Example:

xFuture603

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xFuture603

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