Fix error of CircleCI (#564)

.circleci/config.yml

@@ -3,6 +3,7 @@ jobs:
   cansetup:
     machine:
       enabled: true
+      image: ubuntu-2004:202101-01
     steps:
       - checkout
       - run:

.circleci/test-install.sh

@@ -3,6 +3,7 @@
 set -e
 
 apt-get remove docker-ce
+rm -rf /usr/bin/docker
 rm -rf /usr/local/bin/docker-compose
 
 cd ../..
@@ -24,4 +25,4 @@ timeout 1m bash .circleci/test-connectivity.sh
 
 # Testing scripts are not crashing and installed
 btcpay-up.sh
-btcpay-down.sh
+btcpay-down.sh