Tweak Jenkins setup

Jenkinsfile

@@ -15,15 +15,12 @@ pipeline {
 		stage('deno') {
 			agent {
 				docker {
-					image 'denoland/deno'
+					image 'denoland/deno:alpine'
 					args '-u root --privileged'
 				}
 			}
 			steps {
-				sh 'wget -qO - 'https://proget.makedeb.org/debian-feeds/prebuilt-mpr.pub' | gpg --dearmor | sudo tee /usr/share/keyrings/prebuilt-mpr-archive-keyring.gpg 1> /dev/null'
-				sh 'echo "deb [arch=all,$(dpkg --print-architecture) signed-by=/usr/share/keyrings/prebuilt-mpr-archive-keyring.gpg] https://proget.makedeb.org prebuilt-mpr $(lsb_release -cs)" | sudo tee /etc/apt/sources.list.d/prebuilt-mpr.list'
-        sh 'apt update'
-				sh 'apt install -y just'
+				sh 'apk add just'
 				sh 'just deno-test'
 			}
 		}