Run PostgreSQL with RocksDB in Docker

We can deploy PostgreSQL with RocksDB in Docker container.

Testing

Start the container with the following Docker image we have provided.

Run a Docker container:

docker run -d --name postgresql -p 5432:5432 vidardb/postgresql:rocksdb-6.2.4

Connect to the PostgreSQL:
```
psql -h 127.0.0.1 -p 5432 -U postgres
```
Please note that PostgreSQL client should already be installed before running the container.

We can build a new Docker image in the following way. It is the prerequisite that install docker engine in the building machine.

Install Docker engine:

Docker engine is available on multiple platforms. Just follow the official doc to choose the best installation option for you.
Build Docker image:
```
make docker-image
```
After executing the previous command, it will build docker image with the default image repository and name: vidardb/postgresql:rocksdb-6.2.4.

We can also specify the build parameters:
```
REGISTRY=<YOUR REGISTRY ADDRESS> IMAGE=<YOUR IMAGE NAME> TAG=<YOUR IMAGE TAG> make docker-image 
```