Handle multi-line release notes

See https://trstringer.com/github-actions-multiline-strings/

Author: 0xced

.github/workflows/continuous-integration.yml

@@ -47,7 +47,11 @@ jobs:
       - name: Retrieve tag message
         run: |
           git fetch --tags --force
-          echo "::set-output name=release-notes::$(git tag --list ${{ steps.dotnet-pack.outputs.version }} --format='%(contents)')"
+          RELEASE_NOTES=$(git tag --list ${{ steps.dotnet-pack.outputs.version }} --format='%(contents)')
+          RELEASE_NOTES="${RELEASE_NOTES//'%'/'%25'}"
+          RELEASE_NOTES="${RELEASE_NOTES//$'\n'/'%0A'}"
+          RELEASE_NOTES="${RELEASE_NOTES//$'\r'/'%0D'}"
+          echo "::set-output name=release-notes::$RELEASE_NOTES"
         id: tag-message
   publish:
     runs-on: macos-latest