Fix regex for EcsResource when image includes @sha256:<hash>

Fixes #1788

Author: danielcompton

aws-resources/src/main/java/io/opentelemetry/contrib/aws/resource/EcsResource.java

@@ -314,7 +314,7 @@ private static class DockerImage {
 
     private static final Pattern imagePattern =
         Pattern.compile(
-            "^(?<repository>([^/\\s]+/)?([^:\\s]+))(:(?<tag>[^@\\s]+))?(@sha256:(?<sha256>\\d+))?$");
+            "^(?<repository>([^/\\s]+/)?([^:\\s]+))(:(?<tag>[^@\\s]+))?(@sha256:(?<sha256>\\p{XDigit}+))?$");
 
     final String repository;
     final String tag;

aws-resources/src/test/java/io/opentelemetry/contrib/aws/resource/EcsResourceTest.java

@@ -162,4 +162,26 @@ void inServiceLoader() {
   String readResourceJson(String resourceName) throws IOException {
     return Resources.toString(Resources.getResource(resourceName), StandardCharsets.UTF_8);
   }
+
+  @Test
+  void testImageWithSha256Digest() throws IOException {
+    // Create a minimal JSON with just the Image field containing a SHA256 digest
+    String json = "{\"Image\": \"111122223333.dkr.ecr.us-east-1.amazonaws.com/myapp:a635776144e10255377fa15957781eb11f59daa7@sha256:ca8528f563912012ee19777fad134b9abbe305c5d7fcf62c4c351a4eb8656dd8\"}";
+
+    Map<String, String> mockSysEnv = new HashMap<>();
+    mockSysEnv.put(ECS_METADATA_KEY_V4, "ecs_metadata_uri");
+
+    when(mockHttpClient.fetchString("GET", "ecs_metadata_uri", Collections.emptyMap(), null))
+        .thenReturn(json);
+    when(mockHttpClient.fetchString("GET", "ecs_metadata_uri/task", Collections.emptyMap(), null))
+        .thenReturn("{}");
+
+    Resource resource = EcsResource.buildResource(mockSysEnv, mockHttpClient);
+    Attributes attributes = resource.getAttributes();
+
+    assertThat(attributes.get(CONTAINER_IMAGE_NAME))
+        .isEqualTo("111122223333.dkr.ecr.us-east-1.amazonaws.com/myapp");
+    assertThat(attributes.get(CONTAINER_IMAGE_TAGS))
+        .isEqualTo(singletonList("a635776144e10255377fa15957781eb11f59daa7"));
+  }
 }