Add vsdbg for .net core (#23)

Author: quoctruong

skaffold-duct-tape/duct-tape/Dockerfile

@@ -9,6 +9,11 @@ RUN PYTHONUSERBASE=/ptvsd pip install --user ptvsd
 FROM python:3.7 as python37
 RUN PYTHONUSERBASE=/ptvsd pip install --user ptvsd
 
+FROM mcr.microsoft.com/dotnet/core/aspnet:2.1 as netcore
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends unzip \
+    && curl -sSL https://aka.ms/getvsdbgsh | bash /dev/stdin -v latest -l /vsdbg
+
 # Now populate the duct-tape image with the language runtime debugging support files
 # The debian image is about 95MB bigger
 FROM busybox
@@ -19,3 +24,4 @@ WORKDIR /duct-tape
 COPY --from=delve /go/bin/dlv go/bin/
 COPY --from=python27 /ptvsd/ python/
 COPY --from=python37 /ptvsd/ python/
+COPY --from=netcore /vsdbg/ netcore/

skaffold-duct-tape/test/duct-tape-structure-tests.yaml

@@ -8,7 +8,8 @@ fileExistenceTests:
     path: '/duct-tape/python/lib/python2.7/site-packages/ptvsd/__init__.py'
   - name: 'ptvsd for python 3.7'
     path: '/duct-tape/python/lib/python3.7/site-packages/ptvsd/__init__.py'
-
+  - name: 'vsdbg for .net core'
+    path: '/duct-tape/netcore/vsdbg'
 
 commandTests:
   - name: "run with no /dbg should fail"