Added Jenkinsfile.

Jenkinsfile

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+pipeline {
+  agent {
+    label 'local-agent'
+  }
+
+  options {
+    ansiColor('xterm')
+    timestamps()
+  }
+
+  environment {
+    DOCKER_IMAGE = 'public/kavita-books-organizer'
+    DOCKER_REGISTRY = credentials('docker_registry')
+  }
+
+  stages {
+    stage('Build Docker Image') {
+      when {
+        allOf {
+          branch 'master'
+
+          not {
+            changeRequest()
+          }
+        }
+      }
+
+      steps {
+        echo 'Building docker image...'
+
+        script {
+          image = docker.build(DOCKER_IMAGE)
+        }
+      }
+    }
+
+    stage('Deploy Docker Image') {
+      when {
+        allOf {
+          branch 'master'
+
+          not {
+            changeRequest()
+          }
+        }
+      }
+
+      steps {
+        echo 'Deploying docker image to registry...'
+
+        script {
+          docker.withRegistry(DOCKER_REGISTRY, 'gitea_packages_account') {
+            image.push('latest')
+          }
+        }
+      }
+    }
+  }
+}