Expose structured configuration

[astefanutti]

Issue link

Closes #132

What changes have been made

• Expose a structured configuration API
• Adapt main.go to use the structured configuration

Verification steps

Start InstaScale, make sure it works as expected.

[astefanutti]

/assign @anishasthana @asm582

[anishasthana]

/hold (I want to make sure we get the codeflare-sdk hotfix release out before this is merged in)

[anishasthana]

/unhold

[VanillaSpoon]

Hey, the pkg/config directory is not being copied into the Docker image during the build process causing the build command to fail.

Just a quick change to the Dockerfile:

# Copy the go source
COPY main.go main.go
COPY controllers/ controllers/
+ COPY pkg/ pkg/

[astefanutti]

@VanillaSpoon great catch, thanks! Fixed in 0c0fa54.

[asm582]

/LGTM

[VanillaSpoon]

/lgtm also :)

[openshift-ci]

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