Introducing --output flag on get-usns action. (#1027)

* removing logging usns

* feat: adding usns_output_path flag

* fix: using correct flag

Author: pacostas

actions/stack/get-usns/action.yml

@@ -6,7 +6,7 @@ description: |
 
 outputs:
   usns:
-    description: JSON array of patched USNs
+    description: JSON array of patched USNs or path to JSON file, if usns_output_path flag is specified
 
 inputs:
   feed_url:
@@ -27,6 +27,9 @@ inputs:
   distribution:
     description: 'Ubuntu distribution of stack (bionic|focal|jammy|noble)'
     required: true
+  usns_output_path:
+    description: 'Path to output usns JSON file'
+    required: false
 
 runs:
   using: 'docker'
@@ -42,3 +45,5 @@ runs:
   - "${{ inputs.packages_filepath }}"
   - "--distro"
   - "${{ inputs.distribution }}"
+  - "--output"
+  - "${{ inputs.usns_output_path }}"

actions/stack/get-usns/entrypoint/main.go

@@ -151,7 +151,6 @@ func main() {
 		output = []byte(`[]`)
 	}
 
-	fmt.Println("Output: ", string(output))
 	outputFileName, ok := os.LookupEnv("GITHUB_OUTPUT")
 	if !ok {
 		log.Fatal("GITHUB_OUTPUT is not set, see https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter")
@@ -161,7 +160,6 @@ func main() {
 		log.Fatal(err)
 	}
 	defer file.Close()
-	fmt.Fprintf(file, "usns=%s\n", string(output))
 
 	if config.Output != "" {
 		path, err := filepath.Abs(config.Output)
@@ -172,6 +170,8 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
+	} else {
+		fmt.Fprintf(file, "usns=%s\n", string(output))
 	}
 }