Add proper changelog extraction

Signed-off-by: kramaranya <kramaranya15@gmail.com>

Author: kramaranya

.github/workflows/release.yml

@@ -5,8 +5,6 @@ on:
     tags:
       - 'v*.*.*'
       - 'v*.*.*-rc.*'
-      - 'v*.*.*-alpha.*'
-      - 'v*.*.*-beta.*'
 
 permissions:
   contents: write
@@ -108,6 +106,9 @@ jobs:
     name: Create GitHub Release
     needs: [build, publish-pypi]
     runs-on: ubuntu-latest
+    environment:
+      name: release
+      url: https://github.com/kubeflow/sdk/releases
 
     steps:
       - uses: actions/checkout@v4
@@ -120,16 +121,23 @@ jobs:
           VERSION="${{ needs.build.outputs.version }}"
 
           if [[ -f CHANGELOG.md ]]; then
-            CHANGELOG=$(awk "/^# \[?v?$VERSION\]?/,/^# \[?v?[0-9]/" CHANGELOG.md | sed '$d' | tail -n +2)
+            NEXT_VERSION=$(sed -n "/^# \[v$VERSION\]/,\$p" CHANGELOG.md | tail -n +2 | grep -m1 "^# \[v[0-9]" || echo "")
+            if [[ -n "$NEXT_VERSION" ]]; then
+              CHANGELOG=$(sed -n "/^# \[v$VERSION\]/,/^# \[v[0-9]/p" CHANGELOG.md | sed '$d' | tail -n +2)
+            else
+              CHANGELOG=$(sed -n "/^# \[v$VERSION\]/,\$p" CHANGELOG.md | tail -n +2)
+            fi
             if [[ -n "$CHANGELOG" ]]; then
-              echo "changelog<<EOF" >> $GITHUB_OUTPUT
-              echo "$CHANGELOG" >> $GITHUB_OUTPUT
-              echo "EOF" >> $GITHUB_OUTPUT
+              {
+                echo "changelog<<EOF"
+                echo "$CHANGELOG"
+                echo "EOF"
+              } >> $GITHUB_OUTPUT
             else
-              echo "**Note:** CHANGELOG.md was not updated for this release" >> $GITHUB_OUTPUT
+              echo "changelog=**Note:** CHANGELOG.md was not updated for this release" >> $GITHUB_OUTPUT
             fi
           else
-            echo "**Note:** CHANGELOG.md not found" >> $GITHUB_OUTPUT
+            echo "changelog=**Note:** CHANGELOG.md not found" >> $GITHUB_OUTPUT
           fi
 
       - name: Create GitHub Release