fix(ci): add explicit origin to fix release detached head

Author: heitorlessa

.github/workflows/reusable_publish_changelog.yml

@@ -6,6 +6,9 @@ on:
 permissions:
   contents: write
 
+env:
+  GIT_ORIGIN: https://github.com/awslabs/aws-lambda-powertools-python
+
 jobs:
   publish_changelog:
     # Force Github action to run only a single job at a time (based on the group name)
@@ -18,12 +21,17 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
-      - name: Git client setup and refresh tip
+      - name: Git client setup
         run: |
           git config user.name "Release bot"
           git config user.email "aws-devax-open-source@amazon.com"
           git config pull.rebase true
-          git pull --rebase
+      - name: Git references setup and refresh
+        # `release` event trigger uses DETACHED Head instead of trunk like all other events
+        # so we need to explicitly configure it
+        run: |
+          git remote add origin ${GIT_ORIGIN}
+          git pull origin develop --rebase
       - name: "Generate latest changelog"
         run: make changelog
       - name: Update Changelog in trunk