Added build artifact uploads to the github actions CI and removed duplicate READMEs (#300)

.github/workflows/main.yml

@@ -32,3 +32,29 @@ jobs:
       - name: Run Tests
         if: ${{ matrix.os == 'ubuntu-latest' }}
         run: zig build test
+
+      - name: Build artifacts
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: |
+          declare -a targets=("x86_64-windows" "x86_64-linux" "x86_64-macos" "i386-windows" "i386-linux")
+          mkdir -p "artifacts/"
+
+          for target in "${targets[@]}"; do
+            mkdir -p artifacts/$target
+            echo "Building target ${target}..."
+            zig build -Dtarget=${target} -Drelease-safe --cache-dir artifacts/${target}/
+            sed -e '1,5d' < README.md > artifacts/${target}/README.md
+            cp LICENSE.md artifacts/${target}/
+            cd artifacts/${target}/
+            tar cfJ ${target}.tar.xz *.md bin/*
+            mv ${target}.tar.xz ../
+            cd ../..
+          done
+
+      - name: Upload artifacts
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        uses: actions/upload-artifact@v2
+        with:
+          name: builds
+          path: artifacts/*.tar.xz
+