Fix shell quoting

Bash interprets the "&" as an instruction to run in background, even
though it's in the middle of a string. That's what I get for testing
this in Fish!

Author: SquidDev

.github/workflows/ci-wasm32-wasi.yml

@@ -16,10 +16,10 @@ jobs:
 
       - name: Build
         run: |
-          nix shell gitlab:haskell-wasm/ghc-wasm-meta?host=gitlab.haskell.org&rev=${GHC_WASM_META}#{wasmtime,wasm32-wasi-cabal-9_12,wasm32-wasi-ghc-9_12} --command \
+          nix shell "gitlab:haskell-wasm/ghc-wasm-meta?host=gitlab.haskell.org&rev=${GHC_WASM_META}"#{wasmtime,wasm32-wasi-cabal-9_12,wasm32-wasi-ghc-9_12} --command \
             wasm32-wasi-cabal build
 
       - name: Test
         run: |
-          nix shell gitlab:haskell-wasm/ghc-wasm-meta?host=gitlab.haskell.org&rev=${GHC_WASM_META}#{wasmtime,wasm32-wasi-cabal-9_12,wasm32-wasi-ghc-9_12} --command \
+          nix shell "gitlab:haskell-wasm/ghc-wasm-meta?host=gitlab.haskell.org&rev=${GHC_WASM_META}"#{wasmtime,wasm32-wasi-cabal-9_12,wasm32-wasi-ghc-9_12} --command \
             wasm32-wasi-cabal test --test-wrapper ./tests/run-wasmtime.sh