fix(ci): replace heredoc with printf to avoid YAML parsing errors

.forgejo/workflows/build.yml

@@ -43,13 +43,7 @@ jobs:
         run: |
           VERSION=${{ steps.version.outputs.version }}
           DATE=$(date -R)
-          cat > debian/changelog <<EOF
-full-updater (${VERSION}) unstable; urgency=medium
-
-  * Auto-built release from commit ${GITHUB_SHA}
-
- -- Forgejo CI <ci@geronzi.fr>  ${DATE}
-EOF
+          printf '%s\n' "full-updater (${VERSION}) unstable; urgency=medium" "" "  * Auto-built release from commit ${GITHUB_SHA}" "" " -- Forgejo CI <ci@geronzi.fr>  ${DATE}" > debian/changelog
 
       - name: Install build dependencies
         run: |