feat(docker): sign built images with cosign #1251

Job	Run time
ci / linter / 📌 Check GitHub Actions Pinning	6s
ci / linter / 🛡️ CodeQL Analysis (actions)	1m 1s
ci / linter / 🧹 Lint Code Base	1m 46s
ci / test-action-get-image-metadata	0s
ci / test-action-helm-parse-chart-uri	0s
ci / test-action-action-get-image-name	0s
ci / Test docker build images	0s
ci / test-action-helm-release-chart	0s
ci / test-action-helm-test-chart	0s
ci / test-action-docker-prune-pull-requests-package-version	0s
ci / test-action-docker-build-image	0s
	2m 53s

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