Resolve Issue 417 - Missing node-gyph-build

[cipherzzz]

Resolves #417

Summary of Changes

Added

RUN npm install -g node-gyp-build

to sbtc/devenv/stacks-explorer/docker/Dockerfile

Testing

devenv/build.sh ran successfully

Risks

NA

How were these changes tested?

devenv/build.sh ran successfully

What future testing should occur?

NA

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• [] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[CLAassistant]

All committers have signed the CLA.