fix: fix multi platform go build in docker push workflow

[rnbguy]

Description

Closes: #13989

• GOOS=$TARGETOS GOARCH=$TARGETARCH in Dockerfile to fix multi-platform build. [Ref]
• Sets up docker build and push for ghcr.io
• Replaces old logic to parse version tag with docker/metadata-action

Event	Ref	Docker Tags
push	refs/heads/main	latest
push tag	refs/tags/v0.45.8	v0.45.8, latest-0.45
push tag	refs/tags/v0.46.7	v0.46.7, latest-0.46

Example container package on my fork - https://github.com/rnbguy/cosmos-sdk/pkgs/container/cosmos-sdk

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[rnbguy]

@tac0turtle I see the build is failed. Also, the cosmos-sdk package page is giving 500. Can you check if this repo has the correct access for the package?

[tac0turtle]

Yup will, could be the package isnt created so its having issues create it