Update Docker image tag latest with release only

[vbaranov]

#6787

Motivation

Currently latest docker image tag is updated on every push to master branch and every release issuance. But, update from every push to master is built only for linux/amd64 arch whereas release-based images are multi-platform.

Changelog

• Update latest Docker image tag only from release issuance.
• With every push to master branch update master Docker image tag.
• Remove platform param from docker-compose configs.

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools