fix: Install trivy using apt-get

try-copa/background.sh

@@ -12,6 +12,10 @@ curl -s https://api.github.com/repos/project-copacetic/copacetic/releases/latest
 tar -xzf copa*
 mv copa /usr/local/bin/copa
 
-snap install trivy
+apt-get install wget gnupg
+wget -qO - https://aquasecurity.github.io/trivy-repo/deb/public.key | gpg --dearmor | tee /usr/share/keyrings/trivy.gpg > /dev/null
+echo "deb [signed-by=/usr/share/keyrings/trivy.gpg] https://aquasecurity.github.io/trivy-repo/deb generic main" | tee -a /etc/apt/sources.list.d/trivy.list
+apt-get update
+apt-get install trivy
 
 touch /tmp/finished