feat: Add docker workflows for covenant_signer #96

Job	Run time
go_sec_covenant_signer	1m 14s
docker_pipeline / prepare-metadata	1s
docker_pipeline / dockerfile_lint	0s
lint_test / build	30s
lint_test / lint	23s
lint_test / unit-tests	1m 23s
lint_test / integration-tests	7m 1s
docker_pipeline_covenant_signer / prepare-metadata	1s
lint_test / check-mock-gen	0s
lint_test / gosec	2m 27s
docker_pipeline_covenant_signer / dockerfile_lint	0s
docker_pipeline_covenant_signer / docker_build	0s
docker_pipeline / docker_build	0s
docker_pipeline_covenant_signer / merge_ecr	0s
docker_pipeline_covenant_signer / merge_dockerhub	0s
docker_pipeline / merge_dockerhub	0s
docker_pipeline / merge_ecr	0s
docker_pipeline_covenant_signer / vulnerability_scan	0s
docker_pipeline / vulnerability_scan	0s
	13m 0s

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