ci: setup wasm check on gnovm

.github/workflows/gnovm.yml

@@ -23,10 +23,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [ "1.19.x", "1.20.x" ]
-        goarch: [ "amd64" ]
-        goos: [ "linux" ]
-        program: [ "gno" ]
+        go-version: # two latest versions
+          - "1.19.x"
+          - "1.20.x"
+        goenv: # TODO: replace with pairs, so it's easier to read in the GH interface.
+          - "GOARCH=amd64 GOOS=linux"
+          - "GOARCH=js GOOS=wasm"
+        program:
+          - "gno"
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
@@ -36,7 +40,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: go install
         working-directory: gnovm
-        run: GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go install ./cmd/${{ matrix.program }}
+        run: ${{ matrix.goenv }} go install ./cmd/${{ matrix.program }}
 
   test:
     strategy: