Add example showing how to build project inside docker container

pipeline-examples/build-in-docker-container/BuildInDockerContainer.groovy

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+node {
+    stage('checkout') {
+        git url: 'https://repository.com/foo/golang-project.git'
+    }
+    stage("build") {
+        writeFile file: "test.txt", text: "test"
+        docker.withRegistry("https://my-private-registry.intranet.net", 'docker-registry-credentials') {
+            docker.image("my-private-registry.intranet.net/tool/golang").inside("-v /home/jenkins/foo.txt:/foo.txt") { c ->
+                sh 'cat /foo.txt' // we can mount any file from host
+                sh 'cat test.txt' // we can access files from workspace
+                sh 'echo "modified-inside-container" > test.txt' // we can modify files in workspace
+                sh 'go build' // we can run command from docker image
+                sh 'printenv' // jenkins is passing all envs variables into container
+            }
+        }
+        sh 'cat test.txt' // will be "modified-inside-container" here
+    }
+}

pipeline-examples/build-in-docker-container/README.md

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+# Synopsis
+
+This is very simple example showing how to build project inside docker container using image coming from private docker registry.
+
+docker-registry-credentials is credentials id configured as username/password in jenkins.
+