Add Windows, macOS and FreeBSD CI

Author: ethercrow

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/freebsd.yml

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+name: freebsd-ci
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    # This job intentionally is using macOS because at the time of the writing
+    # Linux and Windows environments don't have the necessary virtualization features.
+    # See https://github.com/vmactions/freebsd-vm#under-the-hood.
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Test
+      id: build-freebsd
+      uses: vmactions/[email protected]
+      with:
+        usesh: true
+        mem: 4096
+        prepare: pkg install -y ghc hs-cabal-install git
+        # Virtual machine does not allow to leverage cache
+        # and is quite slow, so only tests are run.
+        run: |
+          cabal update
+          cabal test --test-show-details=direct

.github/workflows/windows_and_macOS.yml

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+name: win-mac-ci
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ['windows-latest', 'macOS-latest']
+        ghc: ['9.0']
+      fail-fast: false
+    steps:
+    - uses: actions/checkout@v2
+    - uses: haskell/actions/setup@v1
+      id: setup-haskell-cabal
+      with:
+        ghc-version: ${{ matrix.ghc }}
+    - name: Update cabal package database
+      run: cabal update
+    - uses: actions/[email protected]
+      name: Cache cabal stuff
+      with:
+        path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
+        key: ${{ runner.os }}-${{ matrix.ghc }}
+    - name: Test
+      run: cabal test
+    - name: Haddock
+      run: cabal haddock
+    - name: SDist
+      run: cabal sdist