Helm dependency

[sebradloff]

Proposed Changes

• Introduces a new external dependency of type helm. Allows the user to download a helm chart and its subcharts.
• Upgrades to golang 1.14.

[ramaro]

Thanks for the great contribution! Reviewing...

[uberspot]

It would be great to include along with this PR an update to https://github.com/deepmind/kapitan/blob/master/docs/kap_proposals/kap_2_helm_charts_input_type.md so that it reflects the new input capabilities after this is merged?
To make sure it's rolled out at the same time as the code.

[sebradloff]

It would be great to include along with this PR an update to https://github.com/deepmind/kapitan/blob/master/docs/kap_proposals/kap_2_helm_charts_input_type.md so that it reflects the new input capabilities after this is merged?
To make sure it's rolled out at the same time as the code.

@uberspot Agreed. I'd like to add to the dependency manger documentation and provide a "complete" helm example in the examples directory.

[ramaro]

@sebradloff can you remove kapitan/dependency_manager/helm/helm_fetch.so
Other than that, this LGTM

[sebradloff]

@sebradloff can you remove kapitan/dependency_manager/helm/helm_fetch.so
Other than that, this LGTM

@ramaro the helm input has a libetemplate.so file checked in as well. Would you like me to gitignore all .so files? The kapitan/dependency_manager/helm/helm_fetch.so is quite large so that seems totally reasonable to not have checked in along with the fact it gets built anyway during the CI steps.

[yoshi-1224]

@sebradloff thanks for the great contribution! I also think it's a good idea to gitignore the .so files as well as all the other auto-generated files (e.g. header files generated by cgo such as libtemplate.h, helm_fetch.h etc.). I didn't update the gitignore file when I was working on helm binding but it makes sense to do so. The rest seems great!

[ramaro]

Agree, let's add .so to ignore. Thanks both!