Add a release job to automatically generate artifacts upon release

.github/workflows/release.yml

@@ -0,0 +1,32 @@
+on: 
+  release:
+    types: [published]
+
+name: Release
+jobs:
+  release-linux-amd64:
+    name: release linux/amd64
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up Go 1.13
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13
+      id: go
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v1
+    - name: Build
+      env:
+        GOOS: linux
+        CGO_ENABLED: 0
+      run: make
+    - name: Upload Release Asset
+      id: upload-release-asset 
+      uses: actions/[email protected]
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ./cryptowat_exporter
+        asset_name: cryptowat_exporter_${{ github.event.release.tag_name}}_linux_amd64
+        asset_content_type: application/binary