Fix and refine workflows (#199)

* Fix linter: ansible not found error
* Refine codeql: only run on *.go files

.github/workflows/codeql-analysis.yml

@@ -3,9 +3,13 @@ name: "CodeQL"
 on:
   push:
     branches: [master]
+    paths:
+      - "**/*.go"
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [master]
+    paths:
+      - "**/*.go"
   schedule:
     - cron: '0 0 * * 1'