ci: add cabal cache logic

Author: TerrorJack

.github/workflows/build.yml

@@ -20,6 +20,15 @@ jobs:
       - name: install-nix
         uses: DeterminateSystems/nix-installer-action@v16
 
+      - name: wasm-cabal-cache
+        uses: actions/cache@v3
+        with:
+          key: nix-build-cache-${{ github.run_id }}
+          restore-keys: nix-build-cache-
+          path: |
+            ~/.ghc-wasm/.cabal/store
+            dist-newstyle
+
       - name: build-frontend
         run: |
           nix develop --command bash -c "cd frontend && wasm32-wasi-cabal update && exec ./build.sh --low-memory-unused --converge --gufa --flatten --rereloop -Oz"
@@ -52,6 +61,15 @@ jobs:
 
       - uses: dw-labs-org/dart-sass-gha@v1
 
+      - name: wasm-cabal-cache
+        uses: actions/cache@v3
+        with:
+          key: ghcup-build-cache-${{ github.run_id }}
+          restore-keys: ghcup-build-cache-
+          path: |
+            ~/.local/state/cabal/store
+            dist-newstyle
+
       - name: build-frontend
         run: |
           cd frontend
@@ -85,6 +103,15 @@ jobs:
 
       - uses: dw-labs-org/dart-sass-gha@v1
 
+      - name: wasm-cabal-cache
+        uses: actions/cache@v3
+        with:
+          key: non-nix-build-cache-${{ github.run_id }}
+          restore-keys: non-nix-build-cache-
+          path: |
+            ~/.ghc-wasm/.cabal/store
+            dist-newstyle
+
       - name: build-frontend
         run: |
           cd frontend