Validate build settings at startup time

src/runboat/models.py

@@ -182,10 +182,6 @@ class Build(BaseModel):
         build_settings = settings.get_build_settings(
             commit_info.repo, commit_info.target_branch
         )
-        if len(build_settings) > 1:
-            raise NotImplementedError(
-                "Having more than one build per commit is not supported yet."
-            )
         deployment_vars = k8s.make_deployment_vars(
             k8s.DeploymentMode.deployment,
             name,

src/runboat/settings.py

@@ -1,8 +1,7 @@
 import re
 from typing import Optional
 
-from pydantic import BaseSettings
-from pydantic.main import BaseModel
+from pydantic import BaseModel, BaseSettings, validator
 
 from .exceptions import RepoOrBranchNotSupported
 
@@ -16,6 +15,14 @@ class RepoSettings(BaseModel):
     branch: str  # regex
     builds: list[BuildSettings]
 
+    @validator("builds")
+    def validate_builds(cls, v: list[BuildSettings]) -> list[BuildSettings]:
+        if len(v) != 1:
+            raise ValueError(
+                "One and only one build settings is allowed per repo/branch entry."
+            )
+        return v
+
 
 class Settings(BaseSettings):
     # Configuration for supported repositories and branches.