Add Jenkins pipeline to build and push container

Jenkinsfile

@@ -0,0 +1,52 @@
+pipeline {
+    agent any
+
+    environment {
+        REGISTRY_HOST = 'gitea.mindboost.team'
+        IMAGE_NAME    = 'interkollektives/lichterei-web'
+        IMAGE_TAG     = '0.0.1'
+        IMAGE_REF     = "${REGISTRY_HOST}/${IMAGE_NAME}:${IMAGE_TAG}"
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+
+        stage('Build image') {
+            steps {
+                sh """
+                    docker build \
+                      --file kirby/Dockerfile \
+                      --tag ${IMAGE_REF} \
+                      kirby
+                """
+            }
+        }
+
+        stage('Push image') {
+            steps {
+                withCredentials([usernamePassword(
+                    credentialsId: 'gitea-container-registry',
+                    usernameVariable: 'REGISTRY_USER',
+                    passwordVariable: 'REGISTRY_PASSWORD'
+                )]) {
+                    sh """
+                        echo "${REGISTRY_PASSWORD}" | docker login ${REGISTRY_HOST} \
+                            --username "${REGISTRY_USER}" --password-stdin
+                        docker push ${IMAGE_REF}
+                        docker logout ${REGISTRY_HOST}
+                    """
+                }
+            }
+        }
+    }
+
+    post {
+        always {
+            sh 'docker image prune --force'
+        }
+    }
+}