Speed up download time with Webpack

[mayong43111]

I notice that the node_module folder is included in the tag of the publication and need it at run time, but it's very big. I modified to use Webpack to package the project, In my sel-hosted, the Set Up Job step saves 15 seconds. so I recommend using it and remove node_module from tag.

I submitted an RP #68 and I tested it very well

[dzsquared]

Added in #74 and released in v1.2
https://github.com/Azure/sql-action/releases/tag/v1.2

thank you!