Update previous version for 'git compare'

Signed-off-by: Sachin Sahu <75629410+SachinSahu431@users.noreply.github.com>

.github/workflows/changelog-generation.yml

@@ -31,11 +31,12 @@ jobs:
         id: tag_name
         run: |
           echo "tag_name=$(cat VERSION)" >> $GITHUB_ENV
+          echo "prev_tag_name=$(git show HEAD~1:VERSION)" >> $GITHUB_ENV
 
       - name: Get Base SHA from Tag
         id: base_sha
         run: |
-          echo "base_sha=$(git rev-list -n 1 "v${{ env.tag_name }}")" >> $GITHUB_ENV
+          echo "base_sha=$(git rev-list -n 1 "v${{ env.prev_tag_name }}")" >> $GITHUB_ENV
         continue-on-error: true
 
       - name: Create Pull Request

generate-changelog.sh

@@ -7,12 +7,14 @@ CURR_DIR=$(pwd)
 VERSION=$(cat VERSION)
 TAG_NAME="v${VERSION}"
 
+PREVIOUS_VERSION=$(git show HEAD~1:VERSION)
+
 MANUAL_START_SHA=$1
 MANUAL_END_SHA=$2
 
 # Get the start SHA based on the tag, if not manually provided
 if [ -z "$MANUAL_START_SHA" ]; then
-  START_SHA=$(git rev-list -n 1 "${TAG_NAME}")
+  START_SHA=$(git rev-list -n 1 "v${PREVIOUS_VERSION}")
 else
   START_SHA=$MANUAL_START_SHA
 fi