Set up CI and add haddock script

Author: amarrella

.github/workflows/ci.yaml

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+name: CI
+on: [push]
+jobs:
+  tests:
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v1
+    - uses: cachix/install-nix-action@v6
+    - uses: cachix/cachix-action@v3
+      with:
+        name: earnestresearch-public
+        signingKey: '${{ secrets.EARNESTRESEARCH_PUBLIC_CACHIX_SIGNING_KEY }}'
+        file: ci.nix

ci.nix

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+with (import ./. {});
+kubernetes-webhook-haskell.components.library

haddock.sh

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+#!/bin/sh
+set -e
+
+dir=$(mktemp -d dist-docs.XXXXXX)
+trap 'rm -r "$dir"' EXIT
+
+# assumes cabal 2.4 or later
+cabal v2-haddock --builddir="$dir" --haddock-for-hackage --enable-doc
+
+cabal upload -d --publish $dir/*-docs.tar.gz