Try read changelog

.github/workflows/release.yml

@@ -10,12 +10,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+    - name: Read changelog
+      id: read-changelog
+      run: echo "::set-output name=changelog::$(cat CHANGELOG.md)"
     - name: Parse changelog
       uses: actions-ecosystem/action-regex-match@v2
       id: regex-match
       with:
-        text: CHANGELOG.md
-        regex: '## \[${{ github.event.release.tag_name }}\].*\n\n((.|\n)*)(?:## \[[0-9]+.[0-9]+.[0-9]+\])'
+        text: ${{ steps.read-changelog.outputs.changelog }}
+        regex: '## \[${{ github.event.release.tag_name }}\].*\n\n((.|\n)+?)(?:## \[[0-9]+.[0-9]+.[0-9]+\])'
         flags: gm
     - run: echo ${{ steps.regex-match.outputs.group1 }}
     - name: Set release body