Try building (but not packaging yet) binary releases.

.github/workflows/release.yml

@@ -0,0 +1,85 @@
+name: Release
+on:
+  schedule:
+  - cron: '0 0 * * *' # midnight UTC
+
+  push:
+    branches:
+    - release
+
+jobs:
+  dist:
+    name: Dist
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        build: [linux, linux-arm, macos, win-msvc, win-gnu, win32-msvc]
+        include:
+        - build: linux
+          os: ubuntu-20.04
+          rust: nightly
+          target: x86_64-unknown-linux-musl
+        - build: linux-arm
+          os: ubuntu-20.04
+          rust: nightly
+          target: arm-unknown-linux-gnueabihf
+        - build: macos
+          os: macos-latest
+          rust: nightly
+          target: x86_64-apple-darwin
+        - build: win-msvc
+          os: windows-2019
+          rust: nightly
+          target: x86_64-pc-windows-msvc
+        # - build: win-gnu
+        #   os: windows-2019
+        #   rust: nightly-x86_64-gnu
+        #   target: x86_64-pc-windows-gnu
+        # - build: win32-msvc
+        #   os: windows-2019
+        #   rust: nightly
+        #   target: i686-pc-windows-msvc
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Install ${{ matrix.rust }} toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+
+      - name: Build release binary
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --release --locked --target ${{ matrix.target }}
+          
+      - name: Run cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --release --locked
+
+      - name: Strip release binary (linux and macos)
+        if: matrix.build == 'linux' || matrix.build == 'macos'
+        run: strip "target/${{ matrix.target }}/release/rg"
+
+      - name: Strip release binary (arm)
+        if: matrix.build == 'linux-arm'
+        run: |
+          docker run --rm -v \
+            "$PWD/target:/target:Z" \
+            rustembedded/cross:arm-unknown-linux-gnueabihf \
+            arm-linux-gnueabihf-strip \
+            /target/arm-unknown-linux-gnueabihf/release/rg
+
+      # package
+      # upload to nightly release