Improve authentication in api documentation

docs/api.yml

@@ -139,13 +139,8 @@ paths:
     post:
       summary: Adds a new measurement. Non-existent device or sensor will be created automatically.
       operationId: addMeasurement
-      parameters:
-        - in: header
-          name: apiKey
-          description: The api key
-          required: true
-          schema:
-            type: string
+      security:
+        - bearerAuth: []
       requestBody:
         description: Measurement to add
         required: true
@@ -186,6 +181,12 @@ paths:
                 $ref: '#/components/schemas/Measurement'
 
 components:
+  securitySchemes:
+    bearerAuth:
+      type: apiKey
+      name: apiKey
+      in: header
+
   schemas:
     Version:
       type: object