add github workflows

.github/workflows/ci.yml

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+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      # Delete whichever of these you aren't using.
+      - master
+
+jobs:
+
+  # Jobs go here. Most of is article is about things
+  # to put in this section.
+  build-macos:
+    name: "Build on macOS"
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install latest nightly
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly
+            override: true
+            # components: rustfmt, clippy
+      - run: cargo check
+

.github/workflows/homebrew.yml

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+name: Homebrew
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+    - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+jobs:
+  homebrew:
+    name: "Create homebrew release"
+    runs-on: macos-latest
+    steps:
+      - name: Get tag
+        id: push
+        run: |
+          echo ::set-output name=name::${GITHUB_REF#refs/*/}
+          echo ::set-output name=branch::${GITHUB_REF#refs/heads/}
+          echo ::set-output name=tag::${GITHUB_REF#refs/tags/}
+
+      - uses: actions/checkout@v2
+      - name: Install latest nightly
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly
+            override: true
+
+      - name: Run cargo build --release
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release
+
+      - name: Homebrew archive and shasum
+        id: archive
+        run: |
+          cd target/release
+          tar -czf dark-notify-${{ steps.push.outputs.tag }}.tar.gz dark-notify
+          SUM=$(shasum -a 256 dark-notify-${{ steps.push.outputs.tag }}.tar.gz | awk '{print $1}')
+          echo "::set-output name=shasum::$SUM"
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.push.outputs.tag }}
+          release_name: Release ${{ steps.push.outputs.tag }}
+          draft: false
+          prerelease: false
+
+      - name: Upload Release Asset
+        id: upload_release_asset 
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/release/dark-notify-${{ steps.push.outputs.tag }}.tar.gz
+          asset_name: dark-notify-${{ steps.push.outputs.tag }}.tar.gz
+          asset_content_type: application/gzip
+
+      - name: Update Homebrew formula
+        env:
+          HOMEBREW_GITHUB_API_TOKEN: ${{ secrets.BREW_TOKEN }}
+        run: |
+          brew tap cormacrelf/tap
+          brew bump-formula-pr -f --no-browse --no-audit \
+            --version='${{ steps.push.outputs.tag }}' \
+            --sha256='${{ steps.archive.outputs.shasum }}' \
+            --url='${{ steps.upload_release_asset.outputs.browser_download_url }}' \
+            cormacrelf/tap/dark-notify
+