feat(api): add get training by slug endpoint

api/v1/openapi.yaml

@@ -57,6 +57,26 @@ paths:
         "500":
           $ref: "#/components/responses/InternalError"
 
+  /v1/trainings/by-slug/{trainingSlug}:
+    get:
+      summary: Get a training by slug
+      operationId: getTrainingBySlug
+      tags:
+        - Trainings
+      parameters:
+        - $ref: "#/components/parameters/TrainingSlug"
+      responses:
+        "200":
+          description: A training
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/GetTrainingResponse"
+        "404":
+          $ref: "#/components/responses/NotFoundError"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
   /v1/trainings/{trainingID}:
     get:
       summary: Get a training by ID
@@ -484,6 +504,7 @@ components:
       schema:
         $ref: "#/components/schemas/TrainingDateID"
       description: Training Date ID
+
     TrainingDateAttendeeID:
       in: path
       name: trainingDateAttendeeID
@@ -492,6 +513,14 @@ components:
         $ref: "#/components/schemas/TrainingDateAttendeeID"
       description: Training Date Attendee ID
 
+    TrainingSlug:
+      in: path
+      name: trainingSlug
+      required: true
+      schema:
+          type: string
+      description: Training slug
+
   schemas:
     CreateTrainingRequest:
       $ref: "#/components/schemas/NewTraining"