Add OPAMP examples to CI

Author: maxgerhardt

.github/workflows/compile-examples.yml

@@ -86,10 +86,12 @@ jobs:
               fqbn: "arduino:renesas_uno:unor4wifi"
             additional-sketch-paths: |
               - libraries/WiFiS3
+              - libraries/OPAMP
           - board:
               fqbn: "arduino-git:renesas:unor4wifi"
             additional-sketch-paths: |
               - libraries/WiFiS3
+              - libraries/OPAMP
 
     steps:
       - name: Checkout repository