Fix building of release artifacts in GitHub Actions (#375)

Author: adams85

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
         VERSION="${arrTag[2]}"
         VERSION="${VERSION//v}"
         echo "$VERSION"
-        dotnet pack --output artifacts --configuration Release -p:Version=$VERSION
+        dotnet pack src/Esprima/Esprima.csproj --output artifacts --configuration Release -p:Version=$VERSION
 
     - name: Push with dotnet
       run: dotnet nuget push artifacts/*.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json

.github/workflows/staging.yml

@@ -28,7 +28,7 @@ jobs:
       run: dotnet test --configuration Release --logger GitHubActions
 
     - name: Pack with dotnet
-      run: dotnet pack --output artifacts --configuration Release -p:PackageVersion=3.0.0-preview-$GITHUB_RUN_NUMBER
+      run: dotnet pack src/Esprima/Esprima.csproj --output artifacts --configuration Release -p:PackageVersion=3.0.0-preview-$GITHUB_RUN_NUMBER
 
     - name: Push with dotnet
       run: dotnet nuget push artifacts/*.nupkg --api-key ${{ secrets.MYGET_API_KEY }} --skip-duplicate --source https://www.myget.org/F/esprimadotnet/api/v2/package