Refactor/Add testsuite release workflow

[averevki]

Description

• Refactor github CI to push to static AND floating testsuite images every merge. Floating tags are based on last commit SHA
• Add testsuite release workflow that can be triggered by pushing tag named in SymVer convention (vX.Y.Z) or directly in github(tag will be pushed by workflow in that case). The release workflow will push new version github tag, push :latest and :${version} images to the quay, and create new testsuite github release.

Closes #79 Closes #242

Verification steps

Eye review

--OR--

Merge this change to your testsuite fork, add IMG_REGISTRY_USERNAME(quay.io username) and IMG_REGISTRY_TOKEN(quay.io password) to your fork project actions secrets(to be able to push to quay/testsuite). Activate release workflow on github actions page. Push the version tag to activate release workflow.

[Copilot]

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

Files not reviewed (2)

• .github/workflows/build_release_image.yml: Language not supported
• .github/workflows/promote_to_latest.yml: Language not supported

Comments suppressed due to low confidence (3)

.github/workflows/release.yml:20

• [nitpick] Consider quoting the IMG_TAGS value to ensure proper YAML parsing and to avoid any unintended splitting of the tag string.

IMG_TAGS: latest ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.version_tag || github.ref_name }}

.github/workflows/build_unstable_image.yml:12

• [nitpick] Verify that combining 'unstable' with the commit SHA as a space-separated string produces the intended tag format, and consider quoting or reformatting if necessary to match the expected input for the build action.

IMG_TAGS: unstable ${{ github.sha }}

.github/workflows/acceptance.yml:1

• [nitpick] Ensure that the new workflow name 'Code static analysis' accurately reflects the workflow's purpose if it still encompasses broader acceptance tests.

name: Code static analysis

[trepel]

LGTM - I managed to make this work using my own fork. Great work!