ci: Add nightly builds (open-telemetry#948)

* ci: Add nightly builds

This should allow us to get ahead of any gem incompatabilities

* squash: remove unused action

.github/workflows/ci-contrib.yml

@@ -8,6 +8,8 @@ on:
   pull_request:
     branches:
       - main
+  schedule:
+    - cron: "0 0 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number }}  # Ensure that only one instance of this workflow is running per Pull Request

.github/workflows/ci-instrumentation-with-services.yml

@@ -8,6 +8,8 @@ on:
   pull_request:
     branches:
       - main
+  schedule:
+    - cron: "0 0 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number }}  # Ensure that only one instance of this workflow is running per Pull Request

.github/workflows/ci-instrumentation.yml

@@ -8,6 +8,8 @@ on:
   pull_request:
     branches:
       - main
+  schedule:
+    - cron: "0 0 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number }}  # Ensure that only one instance of this workflow is running per Pull Request