Remove docker repo from apt

.travis.yml

@@ -39,20 +39,7 @@ jobs:
       env:
         - TAG=`if [ $TRAVIS_BRANCH == "master" ]; then echo -n latest; else echo -n $TRAVIS_BRANCH; fi`
         - P2P_TAG=$TAG
-      before_install:
-        - sudo systemctl stop docker.service && sudo systemctl stop docker.socket
-        - sudo apt-get install ca-certificates curl
-        - sudo install -m 0755 -d /etc/apt/keyrings
-        - sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
-        - sudo chmod a+r /etc/apt/keyrings/docker.asc
-        - |
-          echo \
-            "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
-            $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
-            sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
-        - sudo apt-get update
       install:
-        - sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
         - git clone https://github.com/koinos/koinos-integration-tests.git
         - pushd koinos-integration-tests
         - go get ./...