ci(windows): use locally-cached DB tool zips when present

archive.mariadb.org / get.enterprisedb.com downloads are extremely slow from
the self-hosted Windows runner (30-40+ min for the MariaDB zip). Check for a
pre-downloaded copy at C:\ci\cache\ first and copy it, falling back to the
network download only when absent.

.gitea/workflows/release.yml

@@ -189,7 +189,13 @@ jobs:
           OUT="${GITHUB_WORKSPACE}/desktop/src-tauri/resources/pg_tools"
           mkdir -p "$OUT"
           URL="https://get.enterprisedb.com/postgresql/postgresql-${PG_VER}-1-windows-x64-binaries.zip"
+          CACHE="/c/ci/cache/postgresql-${PG_VER}-1-windows-x64-binaries.zip"
+          if [ -f "$CACHE" ]; then
+            echo "Using cached PG zip: $CACHE"
+            cp "$CACHE" /tmp/pg.zip
+          else
             curl -fsSL "$URL" -o /tmp/pg.zip
+          fi
           EXPECTED="3508d8f085bc3980f38211a82e3f31e5fcae9952105d3dc2f8be67b64a822baa"
           echo "$EXPECTED  /tmp/pg.zip" | sha256sum -c -
           sha256sum /tmp/pg.zip
@@ -205,7 +211,13 @@ jobs:
           OUT="${GITHUB_WORKSPACE}/desktop/src-tauri/resources/mysql_tools"
           mkdir -p "$OUT"
           URL="https://archive.mariadb.org/mariadb-${MARIADB_VER}/winx64-packages/mariadb-${MARIADB_VER}-winx64.zip"
+          CACHE="/c/ci/cache/mariadb-${MARIADB_VER}-winx64.zip"
+          if [ -f "$CACHE" ]; then
+            echo "Using cached MariaDB zip: $CACHE"
+            cp "$CACHE" /tmp/mariadb.zip
+          else
             curl -fsSL "$URL" -o /tmp/mariadb.zip
+          fi
           sha256sum /tmp/mariadb.zip
           unzip -o /tmp/mariadb.zip -d /tmp/mariadb
           WINROOT="/tmp/mariadb/mariadb-${MARIADB_VER}-winx64"