Added: Development Container configuration (OFBIZ-13151)

Introduced a Development Container (devcontainer) which provides container-based development where tools needed by a developer are already installed, hopefully improving the developer onboarding experience.

.devcontainer/devcontainer.json

@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+{
+  "name": "OFBiz Trunk Dev Container",
+  "image": "mcr.microsoft.com/devcontainers/java:17",
+
+  "forwardPorts": [8080, 8443],
+
+  "features": {
+    // Tool to test GitHub Action Workflows locally.
+   "ghcr.io/dhoeric/features/act:1": {},
+    // Install the GitHub CLI
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    // Provide a nested docker instance inside the dev container
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+  },
+
+  "customizations": {
+    "vscode": {
+      "extensions": [
+       "vscjava.vscode-gradle",
+       "ritwickdey.LiveServer",
+       "vscjava.vscode-java-pack"
+      ],
+      "settings": {
+        "java.jdt.ls.java.home": "/usr/lib/jvm/msopenjdk-current",
+        "java.import.gradle.java.home": "/usr/lib/jvm/msopenjdk-current",
+        "java.compile.nullAnalysis.mode": "automatic",
+        "java.jdt.ls.vmargs": "-XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable"
+      }
+    },
+    "jetbrains": {
+      "backend": "IntelliJ"
+    }
+  },
+
+  "containerUser": "vscode"
+}