- introduce new MERGE_SHA placeholder support into template for PRs (and commit SHA for commit mode)

- FIX https://github.com/mikepenz/release-changelog-builder-action/issues/552

src/releaseNotes.ts

@@ -178,7 +178,7 @@ export class ReleaseNotes {
         htmlURL: '',
         baseBranch: '',
         mergedAt: commit.date,
-        mergeCommitSha: '',
+        mergeCommitSha: commit.sha,
         author: commit.author || '',
         repoName: '',
         labels: new Set(),

src/transform.ts

@@ -246,6 +246,7 @@ function fillTemplate(pr: PullRequestInfo, template: string): string {
     /\${{MERGED_AT}}/g,
     pr.mergedAt.toISOString()
   )
+  transformed = transformed.replace(/\${{MERGE_SHA}}/g, pr.mergeCommitSha)
   transformed = transformed.replace(/\${{AUTHOR}}/g, pr.author)
   transformed = transformed.replace(
     /\${{LABELS}}/g,