create release workflow

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/update.yml

@@ -0,0 +1,36 @@
+name: "Test"
+on:
+  workflow_dispatch:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz
+    - name: Build database
+      run: nix-shell -p nix-index --command "nix-index --db . 2>&1 | grep -v '+ generating index'"
+    - name: Get current date
+      id: date
+      run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
+    - name: Create Release
+      id: create_release
+      uses: actions/create-release@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        tag_name: ${{ steps.date.outputs.date }}
+        release_name: Release ${{ steps.date.outputs.date }}
+        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: ./files
+        asset_name: files
+        asset_content_type: application/octet-stream