Add tests #13

Job	Run time
Lint Dockerfile	8s
Supported processor platforms	10s
Build linux/amd64 image	38s
Build linux/arm image	54s
Build linux/arm64 image	1m 3s
Build linux/386 image	35s
Build linux/ppc64le image	1m 0s
Build linux/riscv64 image	1m 1s
Build linux/s390x image	1m 14s
Scan for vulnerabilities (linux/amd64)	20s
Scan for vulnerabilities (linux/arm)	21s
Scan for vulnerabilities (linux/arm64)	21s
Scan for vulnerabilities (linux/386)	23s
Scan for vulnerabilities (linux/ppc64le)	19s
Scan for vulnerabilities (linux/riscv64)	24s
Scan for vulnerabilities (linux/s390x)	18s
Test linux/amd64	14s
Test linux/arm	23s
Test linux/arm64	25s
Test linux/386	22s
Test linux/ppc64le	23s
Test linux/riscv64	15s
Test linux/s390x	24s
Push	0s
	11m 35s

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