chore(csharp): update cdk configs for new csharp CI builds

- Added package-lambda script to capitalize-string
- Added context to elasticbeanstalk-environment
- Added DO_NOT_AUTOTEST to static-site (requires user credentials in code)
- Added context to static-site

Fixes aws-samples#228  <!-- Please create a new issue if none exists yet -->

csharp/capitalize-string/cdk.json

@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/CapitalizeString/CapitalizeString.csproj"
-}
+  "app": "dotnet publish -c Release CapitalizeStringHandler/src/CapitalizeStringHandler; dotnet run -p src/CapitalizeString"
+}

csharp/elasticbeanstalk/elasticbeanstalk-environment/cdk.json

@@ -1,3 +1,6 @@
 {
-  "app": "dotnet run -p src/ElasticbeanstalkEnvironment/ElasticbeanstalkEnvironment.csproj"
+  "context": {
+    "platform": "arn:aws:elasticbeanstalk:us-east-1::platform/Tomcat 8 with Java 8 running on 64bit Amazon Linux"
+  },
+  "app": "dotnet run -p src/ElasticbeanstalkEnvironment"
 }

csharp/static-site/cdk.json

@@ -1,3 +1,7 @@
 {
+  "context": {
+     "domain": "mystaticsite.com",
+     "subdomain": "www"
+  },
   "app": "dotnet run -p src/StaticSite/StaticSite.csproj"
 }