Add CI for MicroHs

Author: sol

.github/workflows/build.yml

@@ -0,0 +1,14 @@
+name: MicroHs
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: sol/setup-MicroHs@nightly
+      - run: mcabal -r install "--git=https://github.com/hspec/hspec --branch=micro-hs" --dir=hspec-core hspec-core
+      - run: mcabal -r install "--git=https://github.com/hspec/hspec" hspec
+      - run: mcabal -r build