Fix docker: Got permission denied while trying to connect to the Docker daemon socket

 According to the official Docker docs here:

https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user

You need to do the following:

To create the docker group and add your user:

• Create the docker group.

sudo groupadd docker

• Add your user to the docker group.

sudo usermod -aG docker ${USER}

• You would need to loog out and log back in so that your group membership is re-evaluated or type the following command:

su -s ${USER}

• Verify that you can run docker commands without sudo.

docker run hello-world

• This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

• If you initially ran Docker CLI commands using sudo before adding your user to the docker group, you may see the following error, which indicates that your ~/.docker/ directory was created with incorrect permissions due to the sudo commands.

WARNING: Error loading config file: /home/user/.docker/config.json -
stat /home/user/.docker/config.json: permission denied

• To fix this problem, either remove the ~/.docker/ directory (it is recreated automatically, but any custom settings are lost), or change its ownership and permissions using the following commands:

sudo chown "$USER":"$USER" /home/"$USER"/.docker -R
sudo chmod g+rwx "$HOME/.docker" -R