Updated depreciated stage declarations

Jenkins depreciated the form of the stage step that did not accept a block
argument. https://jenkins.io/doc/pipeline/steps/pipeline-stage-step/#pipeline-stage-step

Jenkinsfile

@@ -13,116 +13,124 @@ properties([
 node('docker && linux-build') {
   timestamps {
     wrap([$class: 'AnsiColorBuildWrapper', colorMapName: 'xterm']) {
-      stage "Environment"
-      checkout scm
-
-      def environment = docker.build('build-environment:build-rock64-image', 'environment')
-
-      environment.inside("--privileged -u 0:0") {
-        withEnv([
-          "USE_CCACHE=true",
-          "RELEASE_NAME=$VERSION",
-          "RELEASE=$BUILD_NUMBER"
-        ]) {
-            stage 'Prepare'
-            sh '''#!/bin/bash
-              set +xe
-              export CCACHE_DIR=$WORKSPACE/ccache
-              ccache -M 0 -F 0
-              git clean -ffdx -e ccache
-            '''
-
-            stage 'Sources'
-            sh '''#!/bin/bash
-              set -xe
-
-              export HOME=$WORKSPACE
-              export USER=jenkins
-
-              repo init -u https://github.com/ayufan-rock64/linux-manifests -b default --depth=1
-
-              repo sync -j 20 -c --force-sync
-            '''
-
-            stage 'U-boot'
-            sh '''#!/bin/bash
-              set +xe
-              export CCACHE_DIR=$WORKSPACE/ccache
-              make u-boot
-            '''
-
-            stage 'Kernel'
-            sh '''#!/bin/bash
-              set +xe
-              export CCACHE_DIR=$WORKSPACE/ccache
-              make kernel
-            '''
-
-            stage 'Images'
-            sh '''#!/bin/bash
-              set +xe
-              export CCACHE_DIR=$WORKSPACE/ccache
-              make -j$(nproc)
-            '''
-        }
-
-        withEnv([
-          "VERSION=$VERSION",
-          "CHANGES=$CHANGES",
-          "PRERELEASE=$PRERELEASE",
-          "GITHUB_USER=$GITHUB_USER",
-          "GITHUB_REPO=$GITHUB_REPO"
-        ]) {
-          stage 'Freeze'
-          sh '''#!/bin/bash
-            # use -ve, otherwise we could leak GITHUB_TOKEN...
-            set -ve
-            shopt -s nullglob
-
-            export HOME=$WORKSPACE
-            export USER=jenkins
-
-            repo manifest -r -o manifest.xml
-          '''
-
-          stage 'Release'
-          sh '''#!/bin/bash
-            set -xe
-            shopt -s nullglob
-
-            github-release release \
-                --tag "${VERSION}" \
-                --name "$VERSION: $BUILD_TAG" \
-                --description "${CHANGES}\n\n${BUILD_URL}" \
-                --draft
-
-            github-release upload \
-                --tag "${VERSION}" \
-                --name "manifest.xml" \
-                --file "manifest.xml"
-
-            for file in *.xz *.deb; do
-              github-release upload \
-                  --tag "${VERSION}" \
-                  --name "$(basename "$file")" \
-                  --file "$file" &
-            done
-
-            wait
-
-            if [[ "$PRERELEASE" == "true" ]]; then
-              github-release edit \
-                --tag "${VERSION}" \
-                --name "$VERSION: $BUILD_TAG" \
-                --description "${CHANGES}\n\n${BUILD_URL}" \
-                --pre-release
-            else
-              github-release edit \
-                --tag "${VERSION}" \
-                --name "$VERSION: $BUILD_TAG" \
-                --description "${CHANGES}\n\n${BUILD_URL}"
-            fi
-          '''
+      stage('Environment') {
+        checkout scm
+
+        def environment = docker.build('build-environment:build-rock64-image', 'environment')
+
+        environment.inside("--privileged -u 0:0") {
+          withEnv([
+            "USE_CCACHE=true",
+            "RELEASE_NAME=$VERSION",
+            "RELEASE=$BUILD_NUMBER"
+          ]) {
+              stage('Prepare') {
+                sh '''#!/bin/bash
+                  set +xe
+                  export CCACHE_DIR=$WORKSPACE/ccache
+                  ccache -M 0 -F 0
+                  git clean -ffdx -e ccache
+                '''
+              }
+
+              stage 'Sources' {
+                sh '''#!/bin/bash
+                  set -xe
+
+                  export HOME=$WORKSPACE
+                  export USER=jenkins
+
+                  repo init -u https://github.com/ayufan-rock64/linux-manifests -b default --depth=1
+
+                  repo sync -j 20 -c --force-sync
+                '''
+              }
+
+              stage('U-boot') {
+                sh '''#!/bin/bash
+                  set +xe
+                  export CCACHE_DIR=$WORKSPACE/ccache
+                  make u-boot
+                '''
+              }
+
+              stage('Kernel') {
+                sh '''#!/bin/bash
+                  set +xe
+                  export CCACHE_DIR=$WORKSPACE/ccache
+                  make kernel
+                '''
+              }
+
+              stage('Images') {
+                sh '''#!/bin/bash
+                  set +xe
+                  export CCACHE_DIR=$WORKSPACE/ccache
+                  make -j$(nproc)
+                '''
+              }
+          }
+
+          withEnv([
+            "VERSION=$VERSION",
+            "CHANGES=$CHANGES",
+            "PRERELEASE=$PRERELEASE",
+            "GITHUB_USER=$GITHUB_USER",
+            "GITHUB_REPO=$GITHUB_REPO"
+          ]) {
+            stage('Freeze') {
+              sh '''#!/bin/bash
+                # use -ve, otherwise we could leak GITHUB_TOKEN...
+                set -ve
+                shopt -s nullglob
+
+                export HOME=$WORKSPACE
+                export USER=jenkins
+
+                repo manifest -r -o manifest.xml
+              '''
+            }
+
+            stage('Release') {
+              sh '''#!/bin/bash
+                set -xe
+                shopt -s nullglob
+
+                github-release release \
+                    --tag "${VERSION}" \
+                    --name "$VERSION: $BUILD_TAG" \
+                    --description "${CHANGES}\n\n${BUILD_URL}" \
+                    --draft
+
+                github-release upload \
+                    --tag "${VERSION}" \
+                    --name "manifest.xml" \
+                    --file "manifest.xml"
+
+                for file in *.xz *.deb; do
+                  github-release upload \
+                      --tag "${VERSION}" \
+                      --name "$(basename "$file")" \
+                      --file "$file" &
+                done
+
+                wait
+
+                if [[ "$PRERELEASE" == "true" ]]; then
+                  github-release edit \
+                    --tag "${VERSION}" \
+                    --name "$VERSION: $BUILD_TAG" \
+                    --description "${CHANGES}\n\n${BUILD_URL}" \
+                    --pre-release
+                else
+                  github-release edit \
+                    --tag "${VERSION}" \
+                    --name "$VERSION: $BUILD_TAG" \
+                    --description "${CHANGES}\n\n${BUILD_URL}"
+                fi
+              '''
+            }
+          }
         }
       }
     }