Build release assets using GitHub Actions

Author: rui314

.github/workflows/build-all.yml

@@ -3,8 +3,6 @@ name: Build all tarballs
 on:
   schedule:
     - cron: '0 0 * * *'
-  release:
-    types: [ published ]
   workflow_dispatch:
 
 jobs:

.github/workflows/release-assets.yml

@@ -0,0 +1,82 @@
+name: Build & attach tarballs on tag push
+
+on:
+  push:
+    tags: ['v[0-9]*']
+
+permissions:
+  contents: write
+  id-token: write
+
+env:
+  TAG: ${{ github.ref_name }}
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        include:
+#          - { target: x86_64,      os: ubuntu-24.04 }
+          - { target: aarch64,     os: ubuntu-24.04-arm }
+#          - { target: arm,         os: ubuntu-24.04-arm }
+#          - { target: riscv64,     os: ubuntu-24.04 }
+#          - { target: ppc64le,     os: ubuntu-24.04 }
+#          - { target: s390x,       os: ubuntu-24.04 }
+#          - { target: loongarch64, os: ubuntu-24.04 }
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Podman
+        run: sudo apt-get update && sudo apt-get install -y podman qemu-user-static
+
+      - name: Login to GitHub Container Registry
+        uses: redhat-actions/podman-login@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build distribution tarballs
+#        run: ./dist.sh ${{ matrix.target }}
+        run: mkdir dist && touch dist/mold-2.40.0-${{ matrix.target }}.tar.gz
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.target }}
+          path: dist/mold-*.tar.gz
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          pattern: *
+          merge-multiple: true
+
+      - name: Ensure release exists (create if missing)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -e
+          if gh release view "$TAG" >& /dev/null; then
+            echo "Existing release found for $TAG"
+          else
+            echo "Creating draft release for $TAG"
+            gh release create "$TAG" --draft \
+              --title "$TAG" \
+              --notes "Automated draft – fill the changelog later."
+          fi
+
+      - name: Upload tarballs
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release upload "$TAG" dist/* --clobber
+          gh release view "$TAG" --json assets --jq '.assets[].name'