chore(release): add UPX compression for linux artifacts

.gitea/workflows/tag-build-artifacts.yml

@@ -39,11 +39,26 @@ jobs:
           cache: true
           cache-dependency-path: go.sum
 
+      - name: Install UPX
+        uses: crazy-max/ghaction-upx@v3
+        with:
+          install-only: true
+
       - name: Build binary
         run: |
           mkdir -p dist
+          output="dist/gosick_${{ matrix.goos }}_${{ matrix.goarch }}"
           GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} CGO_ENABLED=0 \
-            go build -o dist/gosick_${{ matrix.goos }}_${{ matrix.goarch }} ./cmd/homesick
+            go build -o "$output" ./cmd/homesick
+
+      - name: Compress binary with UPX
+        if: ${{ matrix.goos == 'linux' }}
+        run: |
+          set -euo pipefail
+          output="dist/gosick_${{ matrix.goos }}_${{ matrix.goarch }}"
+          if ! upx --best --lzma "$output"; then
+            echo "::warning::UPX compression failed for ${output}; continuing with uncompressed binary"
+          fi
 
       - name: Package artifact
         run: |