feat(release): publish gitea release notes and enable production rollback

.gitea/scripts/extract-release-notes.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env sh
+set -eu
+
+tag="${1:-}"
+
+if [ -z "$tag" ]; then
+  echo "Missing release tag argument (expected vX.Y.Z)."
+  exit 1
+fi
+
+if [ ! -f CHANGELOG.md ]; then
+  echo "CHANGELOG.md not found."
+  exit 1
+fi
+
+version="${tag#v}"
+
+awk -v version="$version" '
+BEGIN {
+  in_section = 0
+  started = 0
+}
+/^## / {
+  if (in_section == 1) {
+    exit
+  }
+
+  if (index($0, version) > 0) {
+    in_section = 1
+    started = 1
+    print $0
+    next
+  }
+}
+{
+  if (in_section == 1) {
+    print $0
+  }
+}
+END {
+  if (started == 0) {
+    exit 2
+  }
+}
+' CHANGELOG.md