Write new workflow to publish release files

.github/workflows/release.yml

@@ -0,0 +1,67 @@
+name: Release
+
+# Trigger the workflow on push or pull request, but only for the main branch
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  stack:
+    name: stack / ${{ matrix.os }} / ghc ${{ matrix.ghc }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        stack: ["2.5.1"]
+        ghc: ["8.10.4"]
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: roottoor
+          POSTGRES_USER: postgres
+          POSTGRES_DB: postgres_ws_test
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: haskell/actions/setup@v1
+      name: Setup Haskell Stack
+      with:
+        ghc-version: ${{ matrix.ghc }}
+        stack-version: ${{ matrix.stack }}
+
+    - uses: actions/[email protected]
+      name: Cache ~/.stack
+      with:
+        path: ~/.stack
+        key: ${{ matrix.os }}-${{ matrix.ghc }}-stack-v3
+
+    - name: Build
+      run: |
+        stack build --system-ghc
+
+    - name: Download ghr
+      run: |
+        curl -sSLO https://github.com/tcnksm/ghr/releases/download/v0.14.0/ghr_v0.14.0_linux_amd64.tar.gz
+        curl -sSLO https://github.com/tcnksm/ghr/releases/download/v0.14.0/v0.14.0_SHASUMS
+        sha256sum --check --ignore-missing v0.14.0_SHASUMS
+        tar --strip-components=1 -zxvf ghr_v0.14.0_linux_amd64.tar.gz ghr_v0.14.0_linux_amd64/ghr
+
+    - name: Calculate and save checksum
+      run:  sha256sum `find .stack-work/dist -executable -type f -name postgres-websockets` > .stack-work/dist/postgres-websockets.sha256
+
+    - name: Publish Release on GitHub
+      run: |
+        mkdir ./release
+        cp .stack-work/dist/postgres-websockets.sha256 `find .stack-work/dist -executable -type f -name postgres-websockets` ./release/
+        VERSION=$(awk '/^version: / { print $2 };' < postgres-websockets.cabal)
+        ./ghr -t ${{ secrets.GITHUB_TOKEN }} ${VERSION} ./release