ci: support local docker development for arm64

[karl-cardenas-coding]

This PR adds support for local development with Docker for Arm architecture based workstations. The current Makefile logic copies over the users node_modules/. Copying the node modules folder generates an issue with the dependencies Sharp. The workaround is to issue an npm install from inside the container during the build.

• Added a .dockerignore file
• Updated README with logo, overview section, and Docker local development steps.
• Updated entry.sh script

The Makefile also had the following updates:

• initialize now does an npm ci vs npm install. This removes the situation where a contributor updates the package-lock.json when not intending to.
• Unused make commands are removed
• Split out the docker build step from the docker-start command

[spectro-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[spectro-prow]

Hi @karl-cardenas-coding. Thanks for your PR.

I'm waiting for a spectrocloud member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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