Dockerfile

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+FROM scratch
+LABEL maintainer "Jonathan Ervine <docker@ervine.org>" architecture="x86_64" alpineversion="3.12.0" build="06072020"
+
+ADD alpine-minirootfs-3.12.0-x86_64.tar.gz /
+CMD ["/bin/sh"]

Jenkinsfile

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+node("docker-node") {
+    docker.withRegistry('https://harbor.ervine.dev', 'jenkins-to-harbor') {
+    
+        git branch: "3.12", url: "ssh://git@git.ervine.org/jonny/x86_64-alpine", credentialsId: 'jenkins-to-git'
+    
+        sh "git rev-parse HEAD > .git/commit-id"
+        def commit_id = readFile('.git/commit-id').trim()
+        println commit_id
+    
+        stage "build"
+        def app = docker.build "library/x86_64/alpine/alpine-3.10"
+    
+        stage "publish"
+        app.push("${env.BUILD_NUMBER}")
+        app.push("latest")
+        app.push("3.12")
+    }
+}