Adding output

action.yml

@@ -322,6 +322,8 @@ outputs:
     description: "Returns all modified YAML keys when the `files_yaml` input is used. i.e. key that contains any path that has either been added, copied, modified, and deleted (ACMRD)"
   changed_keys:
     description: "Returns all changed YAML keys when the `files_yaml` input is used. i.e. key that contains any path that has either been added, copied, modified, and renamed (ACMR)"
+  previous_commit_sha:
+    description: "Returns previous commit sha"
 
 runs:
   using: 'node20'

src/main.ts

@@ -131,6 +131,15 @@ const getChangedFilesFromLocalGitHistory = async ({
     `Retrieving changes between ${diffResult.previousSha} (${diffResult.targetBranch}) → ${diffResult.currentSha} (${diffResult.currentBranch})`
   )
 
+  await setOutput({
+    key: 'previous_commit_sha',
+    value: diffResult.previousSha,
+    writeOutputFiles: inputs.writeOutputFiles,
+    outputDir: inputs.outputDir,
+    json: inputs.json,
+    safeOutput: inputs.safeOutput
+  })
+
   const allDiffFiles = await getAllDiffFiles({
     workingDirectory,
     diffSubmodule,