feat: add dockerfile demo package

Author: martinalbert

Demo/pom.xml

@@ -0,0 +1,60 @@
+<!-- Demo/pom.xml -->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example</groupId>
+    <artifactId>buttercms-demo</artifactId>
+    <version>1.0.0</version>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <!-- Dependency on the local SDK project -->
+        <dependency>
+            <groupId>com.buttercms</groupId>
+            <artifactId>buttercmsclient</artifactId>
+            <version>1.12.1</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <!-- Compile Java sources -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            
+            <!-- Create an executable JAR with dependencies -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.3.0</version>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                        <configuration>
+                            <archive>
+                                <manifest>
+                                    <mainClass>com.demo.Demo</mainClass>
+                                </manifest>
+                            </archive>
+                            <descriptorRefs>
+                                <descriptorRef>jar-with-dependencies</descriptorRef>
+                            </descriptorRefs>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

Demo/src/main/java/com/demo/Demo.java

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+package com.demo;
+
+import com.buttercms.ButterCMSClient;
+import com.buttercms.model.Page;
+import com.buttercms.model.PageResponse;
+import com.buttercms.model.PostResponse;
+import com.buttercms.model.Post;
+import com.demo.PageFields;
+
+import java.util.Map;
+import java.util.HashMap;
+
+
+public class Demo {
+    public static void main(String[] args) {
+        String apiKey = System.getenv("API_KEY");
+        if (apiKey == null || apiKey.isEmpty()) {
+            System.out.println("API_KEY environment variable is not set");
+            return;
+        }
+
+        ButterCMSClient client = new ButterCMSClient(apiKey, true);
+
+        try {
+            PageResponse<PageFields> pageResponse = client.getPage("*", "test-page-1", null, PageFields.class);
+            Page<PageFields> page = pageResponse.getData();
+
+            System.out.println("Page Slug: " + page.getSlug());
+            System.out.println("Page Status: " + page.getStatus());
+            System.out.println("Page Scheduled date: " + page.getScheduled());
+        } catch (Exception e) {
+            System.out.println("Error fetching page: " + e.getMessage());
+        }
+
+        try {
+            PostResponse postResponse = client.getPost("test-blog-post");
+            Post post = postResponse.getData();
+
+            System.out.println("Post Title: " + post.getTitle());
+            System.out.println("Post Status: " + post.getStatus());
+            System.out.println("Post Published date: " + post.getPublished());
+            System.out.println("Post Scheduled date: " + post.getScheduled());
+        } catch (Exception e) {
+            System.out.println("Error fetching post: " + e.getMessage());
+        }
+    }
+}

Demo/src/main/java/com/demo/PageFields.java

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+package com.demo;
+
+public class PageFields {
+    public String title;
+    public String description;
+}

Dockerfile

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+# Stage 1: Build Java SDK and Demo
+FROM openjdk:8-jdk-alpine AS build_java
+
+WORKDIR /src
+COPY . .
+RUN ./mvnw clean install -DskipTests
+RUN ./mvnw -f /src/Demo/pom.xml clean package -DskipTests
+
+# Stage 2: Run the Demo
+FROM openjdk:8-jdk-alpine
+WORKDIR /app
+COPY --from=build_java /src/Demo/target/buttercms-demo-1.0.0-jar-with-dependencies.jar .
+
+ENV API_BASE_URL=https://api.buttercms.com/v2
+ENV API_KEY=your_api_key
+
+CMD ["java", "-jar", "buttercms-demo-1.0.0-jar-with-dependencies.jar"]