Build on Alpine

.forgejo/workflows/build.yml

@@ -2,10 +2,10 @@ on: [push]
 jobs:
   build:
     runs-on: docker
-    container: debian:sid
+    container: eclipse-temurin:21-alpine
     steps:
       - name: Install JDK and other deps
-        run: apt update && apt install --no-install-recommends -y openjdk-21-jdk-headless maven git nodejs curl zstd
+        run: apk add maven git nodejs curl
 
       - name: Checkout
         uses: https://github.com/actions/checkout@v4