fix(addons_updater): patch changelog blank-line insertion

addons_updater/rootfs/etc/cont-init.d/98-fix-changelog-sed.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/with-contenv bashio
+# shellcheck shell=bash
+set -e
+
+UPDATER_SCRIPT="/etc/cont-init.d/99-run.sh"
+
+if [ ! -f "$UPDATER_SCRIPT" ]; then
+    exit 0
+fi
+
+python3 - "$UPDATER_SCRIPT" <<'PY'
+from pathlib import Path
+import sys
+
+path = Path(sys.argv[1])
+text = path.read_text()
+old = '            sed -i "1i " "/data/${BASENAME}/${SLUG}/CHANGELOG.md"'
+new = '''            {
+                tmp_changelog=$(mktemp)
+                printf '\\n' > "$tmp_changelog"
+                cat "/data/${BASENAME}/${SLUG}/CHANGELOG.md" >> "$tmp_changelog"
+                mv "$tmp_changelog" "/data/${BASENAME}/${SLUG}/CHANGELOG.md"
+            }'''
+
+if old in text and new not in text:
+    path.write_text(text.replace(old, new, 1))
+PY