fix(docker): add platform tag and increase frequency of multi-arch manifest workflow

[oguzkaganozt]

Description

Add platform tag (arm64,amd64) and increase the frequency of update-docker-manifest workflow to every 2 hours.

Because image generation happens in seperate workflows for each architecture, to achieve smooth multi-architecture support on ghcr we need to increase the frequency of update-docker-manifest workflow.

update-docker-manifest completes within 2-3 minutes so it would not bring overhead to overal workflows.

!! Merging this PR eliminates the need of merging this PR

Tests performed

amd64-build-push -> https://github.com/autowarefoundation/autoware/actions/runs/10932018202
arm64-build-push -> https://github.com/autowarefoundation/autoware/actions/runs/10932076827
update-docker-manifest -> https://github.com/autowarefoundation/autoware/actions/runs/10937223736

Here is the universe-planning-control combined image after merging separate arch images:

Effects on system behavior

Not applicable.

Interface changes

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[oguzkaganozt]

@youtalk @mitsudome-r please review

[oguzkaganozt]

Here is the universe-planning-control combined image after merging separate arch images @youtalk @mitsudome-r @xmfcx :

[youtalk]

Please merge the latest main branch first.

[oguzkaganozt]

Please review again @youtalk

[youtalk]

LGTM