Add github actions.

.github/workflows/cabal.yml

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+name: cabal
+
+on:
+  push:
+    branches: [ci-cabal, add/github-actions]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    name: ghc ${{ matrix.ghc }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        cabal: ["3.4"]
+        ghc:
+          - "8.10.7"
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    - uses: haskell/actions/setup@v1
+      name: Setup GHC and cabal-install
+      with:
+        ghc-version: ${{ matrix.ghc }}
+        cabal-version: ${{ matrix.cabal }}
+
+    - uses: actions/cache@v2
+      name: cache ~/.cabal/store
+      with:
+        path: ~/.cabal/store
+        key: ${{ runner.os }}-${{ matrix.ghc }}-cabal
+
+    - name: build koka
+      run: |
+        cabal update
+        cabal build
+
+    - name: run tests
+      run: cabal test koka-test --test-show-details=direct

.github/workflows/stack.yml

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+name: stack
+
+on:
+  push:
+    branches: [ci-stack, add/github-actions]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        cabal: ["3.4"]
+        ghc:
+          - "8.10.7"
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    - uses: haskell/actions/setup@v1
+      name: Setup Stack
+      with:
+        enable-stack: true
+        stack-version: 'latest'
+        cabal-version: ${{ matrix.cabal }}
+
+    - uses: actions/cache@v2
+      name: Cache ~/.stack
+      with:
+        path: ~/.stack
+        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
+
+    - name: build koka
+      run: stack build --fast --no-run-tests --no-terminal --stack-yaml=./stack/stack-${{ matrix.ghc }}.yaml
+
+    - name: run tests
+      run: stack test --fast --stack-yaml=./stack/stack-${{ matrix.ghc }}.yaml

stack/stack-8.10.7.yaml

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+resolver: lts-18.14
+packages:
+- '..'
+extra-deps:
+- isocline-1.0.5

stack/stack-8.10.7.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages:
+- completed:
+    hackage: isocline-1.0.5@sha256:ea9cbf9690cf3e252afd56c0e766678dc5f3aab9259a2ee6ec820a598fead989,2420
+    pantry-tree:
+      size: 2061
+      sha256: 47566421f3bd6dbeca6a21ab466c0a705337ba04ef05580368a83bd16df825f3
+  original:
+    hackage: isocline-1.0.5
+snapshots:
+- completed:
+    size: 586069
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/14.yaml
+    sha256: 87842ecbaa8ca9cee59a7e6be52369dbed82ed075cb4e0d152614a627e8fd488
+  original: lts-18.14