use pipeline execution id instead of source version for initiator tagging (#4548)

Author: sallyseok

src/image_builder.py

@@ -654,7 +654,7 @@ def tag_image_with_initiator(image_tag):
     """
     # Shorten huggingface name to avoid breaching 128 char tag limit
     initiator = os.getenv("CODEBUILD_INITIATOR", "").split("/")[-1].replace("huggingface", "hf")
-    return f"{image_tag}-{initiator}-{os.getenv('CODEBUILD_RESOLVED_SOURCE_VERSION', '')[:7]}"
+    return f"{image_tag}-{initiator}-{os.getenv('CODEPIPELINE_EXECUTION_ID', '')[:7]}"
 
 
 def append_tag(image_tag, append_str):