add Jenkinsfile and some Makefile targets for CI (#302)

Signed-off-by: Jakub Sokołowski <jakub@status.im>

Co-authored-by: Oskar Thorén <ot@oskarthoren.com>

Jenkinsfile

@@ -0,0 +1,61 @@
+pipeline {
+  agent { label 'linux' }
+
+  parameters {
+    string(
+      name: 'BRANCH',
+      defaultValue: 'master',
+      description: 'Name of branch to build.'
+    )
+    string(
+      name: 'IMAGE_TAG',
+      defaultValue: 'wakunode2',
+      description: 'Name of Docker tag to push.'
+    )
+    string(
+      name: 'IMAGE_NAME',
+      defaultValue: 'statusteam/nim-waku',
+      description: 'Name of Docker image to push.'
+    )
+    string(
+      name: 'NIM_PARAMS',
+      defaultValue: '-d:disableMarchNative -d:chronicles_colors:none -d:insecure',
+      description: 'Flags for Nim compilation.'
+    )
+  }
+
+  options {
+    timestamps()
+    /* manage how many builds we keep */
+    buildDiscarder(logRotator(
+      numToKeepStr: '10',
+      daysToKeepStr: '30',
+    ))
+  }
+
+  stages {
+    stage('Build') {
+      steps { script {
+        image = docker.build(
+          "${params.IMAGE_NAME}:${env.GIT_COMMIT.take(6)}",
+          "--build-arg=MAKE_TARGET='${params.IMAGE_TAG}' " +
+          "--build-arg=NIM_PARAMS='${params.NIM_PARAMS}' ."
+        )
+      } }
+    }
+
+    stage('Push') {
+      steps { script {
+        withDockerRegistry([credentialsId: "dockerhub-statusteam-auto", url: ""]) {
+          image.push()
+        }
+        withDockerRegistry([credentialsId: "dockerhub-statusteam-auto", url: ""]) {
+          image.push(params.IMAGE_TAG)
+        }
+      } }
+    }
+  } // stages
+  post {
+    always { sh 'docker image prune -f' }
+  } // post
+} // pipeline