CI: add build for nix/wasm.

.github/workflows/ci.yml

@@ -139,32 +139,32 @@ jobs:
       run: |
           stack test --fast
 
-# linux-nix-cabal:
+  nix-wasm:
 
-#   runs-on: ubuntu-latest
-#   strategy:
-#     fail-fast: true
-#   steps:
-#   - uses: actions/checkout@v6
-#   - uses: cachix/install-nix-action@v30
-#     with:
-#       nix_path: nixpkgs=channel:nixos-24.05
-#   - name: Cache cabal global package db
-#     id:   cabal-global
-#     uses: actions/cache@v5
-#     with:
-#       path: |
-#         ~/.local/state/cabal
-#       key: ${{ runner.os }}-nix-cabal-global-${{ secrets.CACHE_VERSION }}
-#   - name: Cache cabal work
-#     id:   cabal-local
-#     uses: actions/cache@v5
-#     with:
-#       path: |
-#         dist-newstyle
-#       key: ${{ runner.os }}-nix-cabal-local-${{ secrets.CACHE_VERSION }}
-#   - run: |
-#       nix-shell --run "cabal update && cabal test --enable-tests --disable-optimization --ghc-options=-Werror all"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+    steps:
+    - uses: actions/checkout@v6
+    - uses: cachix/install-nix-action@v31
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+    - name: Cache cabal global package db
+      id:   cabal-global
+      uses: actions/cache@v5
+      with:
+        path: |
+          ~/.local/state/cabal
+        key: ${{ runner.os }}-nix-cabal-global-${{ secrets.CACHE_VERSION }}
+    - name: Cache cabal work
+      id:   cabal-local
+      uses: actions/cache@v5
+      with:
+        path: |
+          dist-newstyle
+        key: ${{ runner.os }}-nix-cabal-local-${{ secrets.CACHE_VERSION }}
+    - run: |
+        nix develop --command bash -c "cabal update && make pandoc.wasm"
 
   windows: