Fix worker arm template name length

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Worker created deployments will cut flow name length to not reach max 64 character deployment name length
+
 ### Deprecated
 
 ### Removed

prefect_azure/workers/container_instance.py

@@ -108,6 +108,8 @@
 else:
     from pydantic import Field, SecretStr
 
+from slugify import slugify
+
 from prefect_azure.container_instance import ACRManagedIdentity
 from prefect_azure.credentials import AzureContainerInstanceCredentials
 
@@ -566,6 +568,16 @@ async def run(
         flow = await prefect_client.read_flow(flow_run.flow_id)
         container_group_name = f"{flow.name}-{flow_run.id}"
 
+        # Slugify flow.name if the generated name will be too long for the
+        # max deployment name length (64) including "prefect-"
+        if len(container_group_name) > 55:
+            slugified_flow_name = slugify(
+                flow.name,
+                max_length=55 - len(flow_run.id),
+                regex_pattern=r"[^a-zA-Z0-9-]+",
+            )
+            container_group_name = f"{slugified_flow_name}-{flow_run.id}"
+
         self._logger.info(
             f"{self._log_prefix}: Preparing to run command {configuration.command} "
             f"in container  {configuration.image})..."