Add github CI

.github/workflows/haskell.yml

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+name: github-action
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        ghc: ['8.6', '8.8', '8.10', '9.0', '9.2', '9.4', '9.6', '9.8', '9.10']
+        os: ['ubuntu-latest', 'macos-13'] # https://github.com/haskell-actions/setup/issues/77
+    runs-on: ${{ matrix.os }}
+
+    name: GHC ${{ matrix.ghc }} on ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: haskell-actions/setup@v2
+      with:
+        ghc-version: ${{ matrix.ghc }}
+    - name: Cache
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-cabal
+      with:
+        path: ~/.cabal
+        key: ${{ runner.os }}-${{ matrix.ghc }}-build-${{ env.cache-name }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/cabal.project') }}
+        restore-keys: |
+          ${{ runner.os }}-${{ matrix.ghc }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-${{ matrix.ghc }}-build-
+          ${{ runner.os }}-${{ matrix.ghc }}-
+          ${{ runner.os }}
+
+    - name: Install system packages (linux)
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt-get update
+        sudo apt install libsodium-dev
+
+    - name: Install system packages (macos)
+      if: matrix.os == 'macos-13'
+      run: |
+        brew update
+        brew install libsodium
+
+    - name: Set up cabal project file for CI
+      run: cd lib && cp cabal.project.ci cabal.project
+
+    - name: Install dependencies
+      run: |
+        cabal update
+        cd lib && cabal build --only-dependencies --enable-tests --enable-benchmarks all
+    - name: Build obelisk libraries
+      run: cd lib && cabal build --enable-tests --enable-benchmarks all
+    - name: Run tests
+      run: cd lib && cabal test all

lib/cabal.project.ci

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+packages:
+  ./executable-config/inject
+  ./executable-config/lookup
+  ./frontend
+  ./route
+  ./tabulation
+
+if !arch(javascript)
+  packages:
+    ./asset/manifest
+    ./asset/serve-snap
+    ./backend
+--    ./command
+    ./run
+--    ./selftest
+    ./snap-extras
+
+import: cabal.dependencies.project