CI: Update inputs to allow specifying previous version (#92506)

* Update inputs to allow specifying previous version

* Add one more input

.github/workflows/changelog.yml

@@ -2,6 +2,10 @@ name: Generate changelog
 on:
   workflow_call:
     inputs:
+      previous_version:
+        type: string
+        required: false
+        description: 'The release version (semver, git tag, branch or commit) to use for comparison'
       version:
         type: string
         required: true
@@ -26,6 +30,10 @@ on:
 
   workflow_dispatch:
     inputs:
+      previous_version:
+        type: string
+        required: false
+        description: 'The release version (semver, git tag, branch or commit) to use for comparison'
       version:
         type: string
         required: true
@@ -79,6 +87,7 @@ jobs:
         id: changelog
         uses: ./.github/workflows/actions/changelog
         with:
+          previous: ${{ inputs.previous_version }}
           github_token: ${{ steps.generate_token.outputs.token }}
           target: v${{ inputs.version }}
           output_file: changelog_items.md

.github/workflows/release-pr.yml

@@ -8,6 +8,10 @@ name: Complete a Grafana release
 on:
   workflow_dispatch:
     inputs:
+      previous_version:
+        type: string
+        required: false
+        description: 'The release version (semver, git tag, branch or commit) to use for comparison'
       version:
         required: true
         type: string
@@ -38,6 +42,7 @@ jobs:
     name: Create PR to main to update the changelog
     uses: ./.github/workflows/changelog.yml
     with:
+      previous_version: ${{inputs.previous_version}}
       version: ${{ inputs.version }}
       latest: ${{ inputs.latest }}
       dry_run: ${{ inputs.dry_run }}