fix(ci): use node:24-slim (glibc) instead of Alpine (musl)

Native modules like @matrix-org/matrix-sdk-crypto-nodejs detect the
libc type at install time and download the appropriate binary.

Previously, CI used node:24-alpine (musl), so native modules downloaded
musl binaries. But production runs on Debian (glibc), causing runtime
crashes when the glibc binary is expected but not found.

This fix:
- Changes CI to node:24-slim (Debian/glibc)
- Adds python3/make/g++ for native module compilation

Fixes: matrix-sdk-crypto-nodejs-linux-x64-gnu MODULE_NOT_FOUND

.woodpecker/ci.yml

@@ -29,9 +29,10 @@ when:
         - ".trivyignore"
 
 variables:
-  - &node_image "node:24-alpine"
+  - &node_image "node:24-slim"
   - &install_deps |
     corepack enable
+    apt-get update && apt-get install -y --no-install-recommends python3 make g++
     pnpm config set store-dir /root/.local/share/pnpm/store
     pnpm install --frozen-lockfile
   - &use_deps |