Add GreptimeDB Alpine service packaging

.gitea/workflows/build.yml

@@ -38,8 +38,15 @@ jobs:
           scripts/apk/clean.sh
           find packaging/alpine/local -mindepth 2 -maxdepth 2 -name APKBUILD -exec apkbuild-lint {} +
           scripts/apk/ci-build.sh
+          scripts/apk/export-ci-assets.sh
           scripts/apk/list-packages.sh
 
+      - name: Upload generated CI assets
+        uses: actions/upload-artifact@v3
+        with:
+          name: greptimedb-musl-binaries
+          path: packages/ci-assets/
+
       - name: Smoke test
         run: scripts/apk/ci-smoke.sh