Add exec & fix formatting in sagemaker-entrypoint.sh

Use `exec` so that the process runs with PID 1, allowing it to receive
signals directly; and so on, to be gracefully shut down

Author: alvarobartt

sagemaker-entrypoint.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 
 if [[ -z "${HF_MODEL_ID}" ]]; then
-  echo "HF_MODEL_ID must be set"
-  exit 1
+    echo "HF_MODEL_ID must be set"
+    exit 1
 fi
 export MODEL_ID="${HF_MODEL_ID}"
 
 if [[ -n "${HF_MODEL_REVISION}" ]]; then
-  export REVISION="${HF_MODEL_REVISION}"
+    export REVISION="${HF_MODEL_REVISION}"
 fi
 
-text-embeddings-router --port 8080 --json-output
+exec text-embeddings-router --port 8080 --json-output