.forgejo: add generate-tarball job

.forgejo/workflows/generate-tarball.yml

@@ -0,0 +1,31 @@
+on: 
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build-tarball:
+    runs-on: x86_64
+    container:
+      image: alpinelinux/alpine-gitlab-ci:latest
+    env:
+      CI_PROJECT_NAME: zotero
+    steps:
+      - name: Environment setup
+        run: doas apk add nodejs git git-archive-all gzip
+      - name: Repo pull
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 500
+          ref: ${{ github.ref_name }}
+      - name: Package build
+        run: |
+          echo "building tarball for ${{ githug.ref_name }}"
+          git-archive-all --force-submodules $CI_PROJECT_NAME-${{ github.ref_name }}.tar.gz
+          echo "Generating sha512sum"
+          sha512sum $CI_PROJECT_NAME-${{ github.ref_name }}.tar.gz > $CI_PROJECT_NAME-${{ github.ref_name }}.tar.gz.sha512sum
+      - name: Package upload
+        uses: forgejo/upload-artifact@v3
+        with:
+          name: tarball
+          path: $CI_PROJECT_NAME-${{ github.ref_name }}.*