Add automated cross-platform builds

.gitea/workflows/build.yml

@@ -0,0 +1,86 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - "**"
+    tags:
+      - "v*"
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Test and build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: false
+
+      - name: Test
+        run: go test -race ./...
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Build release archives
+        shell: bash
+        env:
+          BUILD_REF: ${{ github.ref }}
+          BUILD_REF_NAME: ${{ github.ref_name }}
+          BUILD_SHA: ${{ github.sha }}
+        run: |
+          set -euo pipefail
+
+          package_version="snapshot-${BUILD_SHA:0:8}"
+          version_flags=""
+          if [[ "$BUILD_REF" == refs/tags/v* ]]; then
+            package_version="${BUILD_REF_NAME//\//-}"
+            version_flags="-X main.version=$BUILD_REF_NAME"
+          fi
+
+          mkdir -p dist
+          for target in \
+            linux/amd64 linux/arm64 \
+            darwin/amd64 darwin/arm64 \
+            windows/amd64 windows/arm64
+          do
+            target_os="${target%/*}"
+            target_arch="${target#*/}"
+            archive="bdrclone-${package_version}-${target_os}-${target_arch}"
+            executable="bdrclone"
+            if [[ "$target_os" == "windows" ]]; then
+              executable="bdrclone.exe"
+            fi
+
+            package_dir="dist/$archive"
+            mkdir -p "$package_dir"
+            CGO_ENABLED=0 GOOS="$target_os" GOARCH="$target_arch" \
+              go build -trimpath -ldflags "-s -w $version_flags" \
+              -o "$package_dir/$executable" ./cmd/bdrclone
+            cp README.md "$package_dir/"
+            tar -C dist -czf "dist/$archive.tar.gz" "$archive"
+            rm -rf "$package_dir"
+          done
+
+          cd dist
+          sha256sum ./*.tar.gz > SHA256SUMS
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: bdrclone-build-${{ github.run_number }}
+          path: |
+            dist/*.tar.gz
+            dist/SHA256SUMS
+          if-no-files-found: error
+          retention-days: 30