build: Only run github actions based on folder changes

Author: alhendrickson

.github/workflows/observability-docker.yml

@@ -6,6 +6,7 @@ on:
  pull_request:
  paths:
  - 'observability/**'
+ - '.github/workflows/observability**'
  tags:
  - 'v*.*.*' # e.g., v0.1.1