build(release): add binary stripping and SHA256 checksums

- Strip Linux binaries to reduce size
- Generate SHA256 checksums for each artifact
- Create consolidated checksums.txt in release
- Use merge-multiple for cleaner artifact handling

Signed-off-by: leocavalcante <[email protected]>

Author: leocavalcante

.github/workflows/release.yml

@@ -41,11 +41,20 @@ jobs:
       - name: Rename binary
         run: mv zig-out/bin/opencoder ${{ matrix.artifact }}
 
+      - name: Strip binary
+        if: matrix.os == 'ubuntu-latest'
+        run: strip ${{ matrix.artifact }}
+
+      - name: Calculate checksum
+        run: sha256sum ${{ matrix.artifact }} > ${{ matrix.artifact }}.sha256
+
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.artifact }}
-          path: ${{ matrix.artifact }}
+          path: |
+            ${{ matrix.artifact }}
+            ${{ matrix.artifact }}.sha256
 
   release:
     needs: build
@@ -55,13 +64,18 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           path: artifacts
+          merge-multiple: true
+
+      - name: Create checksums.txt
+        run: cat *.sha256 > checksums.txt
 
       - name: Create release
         uses: softprops/action-gh-release@v2
         with:
           files: |
-            artifacts/opencoder-linux-amd64/opencoder-linux-amd64
-            artifacts/opencoder-linux-arm64/opencoder-linux-arm64
-            artifacts/opencoder-macos-amd64/opencoder-macos-amd64
-            artifacts/opencoder-macos-arm64/opencoder-macos-arm64
+            opencoder-linux-amd64
+            opencoder-linux-arm64
+            opencoder-macos-amd64
+            opencoder-macos-arm64
+            checksums.txt
           generate_release_notes: true