Add GitHub Actions workflow for automated release builds

.forgejo/workflows/build.yaml

@@ -0,0 +1,32 @@
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        toolchain:
+          - nightly
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Update rust
+        run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+      - name: Build release
+        run: cargo build --release --verbose
+      - name: Collect files
+        run: |
+          mkdir -p /tmp/release
+          cp target/release/phenix /tmp/phenix
+          cp phenix.service /tmp/phenix
+          cd /tmp/phenix
+          tar -czf /tmp/phenix_${{ github.ref_name }}.tar.gz .
+      - name: Make release
+        uses: actions/forgejo-release@v2.6.0
+        with:
+          direction: upload
+          release-dir: /tmp/release
+          token: ${{ secrets.FORGEJO_TOKEN }}