feat: build Docker images (#96)

.ci/Jenkinsfile

@@ -90,6 +90,38 @@ pipeline {
         }
       }
     }
+    /**
+     Publish Docker images.
+     */
+    stage('Publish Docker image'){
+      when {
+        not { changeRequest() }
+      }
+      environment {
+        DOCKER_IMG_TAG = "${env.DOCKER_IMG}:${env.GIT_BASE_COMMIT}"
+        DOCKER_IMG_TAG_BRANCH = "${env.DOCKER_IMG}:${env.BRANCH_NAME}"
+      }
+      steps {
+        cleanup()
+        pushDockerImage()
+      }
+    }
+    /**
+     Publish PR Docker images.
+     */
+    stage('Publish PR Docker image'){
+      when {
+        changeRequest()
+      }
+      environment {
+        DOCKER_IMG_TAG = "${env.DOCKER_IMG_PR}:${env.GIT_BASE_COMMIT}"
+        DOCKER_IMG_TAG_BRANCH = "${env.DOCKER_IMG_PR}:${env.BRANCH_NAME}"
+      }
+      steps {
+        cleanup()
+        pushDockerImage()
+      }
+    }
   }
   post {
     cleanup {
@@ -104,3 +136,28 @@ def cleanup(){
   }
   unstash 'source'
 }
+
+
+def pushDockerImage(){
+  dir("${BASE_DIR}"){
+    dockerLogin(secret: "${env.DOCKER_REGISTRY_SECRET}",
+      registry: "${env.DOCKER_REGISTRY}")
+    sh(label: 'Build Docker image',
+      script: """docker build \
+        -t ${env.DOCKER_IMG_TAG} \
+        --label BRANCH_NAME=${env.BRANCH_NAME} \
+        --label GIT_SHA=${env.GIT_BASE_COMMIT} \
+        --label GO_VERSION=${env.GO_VERSION} \
+        --label TIMESTAMP=\$(date +%Y-%m-%d_%H:%M) \
+        .
+    """)
+    retryWithSleep(retries: 3, seconds: 5, backoff: true){
+      sh(label: 'Push Docker image sha',
+        script: "docker push ${env.DOCKER_IMG_TAG}")
+      sh(label: 'Re-tag Docker image',
+        script: "docker tag ${env.DOCKER_IMG_TAG} ${env.DOCKER_IMG_TAG_BRANCH}")
+      sh(label: 'Push Docker image name',
+        script: "docker push ${env.DOCKER_IMG_TAG_BRANCH}")
+    }
+  }
+}