Comment by xu6ahb8E

Here is an example of post-receive script I use for that:

    #!/usr/bin/env bash

    export APP=appname
    export DOCKER_OPTS=""
    unset GIT_DIR

    rm -rf /home/username/apps/$APP
    cd /home/username/apps && \
    git clone /home/username/git/$APP && \
    cd $APP && \
    echo building image && \
    docker build -t $APP .
    if [[ "$?" != "0" ]]; then
      echo "error while building image."
      exit 1
    fi

    echo "Stopping previous container..."
    docker stop $APP

    echo "Starting new container..."
    sleep 1
    docker run -d --name $APP --rm $APP