add binary build workflow

.github/workflows/build.yml

@@ -0,0 +1,69 @@
+name: Cross-Platform Build on New Tag
+
+on:
+  pull_request:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - os: linux
+            arch: amd64
+          # Uncomment and add other OS and architecture combinations as needed
+          # - os: linux
+          #   arch: arm64
+          # - os: darwin
+          #   arch: amd64
+          - os: darwin
+            arch: arm64
+          # - os: windows
+          #   arch: amd64
+          # - os: windows
+          #   arch: 386
+          # - os: freebsd
+          #   arch: amd64
+          # - os: freebsd
+          #   arch: arm
+    env:
+      BUILDOS: ${{ matrix.os }}
+      BUILDARCH: ${{ matrix.arch }}
+      BINARY_NAME: cryptopower-${{ matrix.os }}-${{ matrix.arch }}
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Copy instantswap file
+      run: cp ./libwallet/instantswap/instant_example.json ./libwallet/instantswap/instant.json
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: ./reproduciblebuilds/Dockerfile
+        load: true
+        platforms: ${{ matrix.os }}/${{ matrix.arch }}
+        push: false
+        tags: user/app:latest
+        build-args: |
+          BUILDOS=${{ env.BUILDOS }}
+          BUILDARCH=${{ env.BUILDARCH }}
+          BUILDNAME=${{ env.BINARY_NAME }}
+
+    - name: Create Container and Copy Binary
+      run: |
+        docker create --name temp-container user/app:latest
+        docker cp temp-container:/app/${{ env.BINARY_NAME }} ./${{ env.BINARY_NAME }}
+        docker rm temp-container
+
+    - name: Upload Binary
+      uses: actions/upload-artifact@v2
+      with:
+        name: ${{ env.BINARY_NAME }}
+        path: ./${{ env.BINARY_NAME }}

reproduciblebuilds/Dockerfile

@@ -8,6 +8,9 @@ ARG BUILDNAME
 RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.35.2
 
 ENV GO111MODULE on
+ENV CGO_ENABLED=0
+ENV GOOS=$BUILDOS
+ENV GOARCH=$BUILDARCH
 
 RUN go version