Add tests #22

Job	Run time
Lint Dockerfile	6s
Supported processor platforms	23s
Build linux/amd64 image	36s
Build linux/arm image	1m 7s
Build linux/arm64 image	1m 4s
Build linux/386 image	47s
Build linux/ppc64le image	1m 9s
Build linux/riscv64 image	1m 3s
Build linux/s390x image	1m 24s
Scan for vulnerabilities (linux/amd64)	25s
Scan for vulnerabilities (linux/arm)	17s
Scan for vulnerabilities (linux/arm64)	19s
Scan for vulnerabilities (linux/386)	20s
Scan for vulnerabilities (linux/ppc64le)	19s
Scan for vulnerabilities (linux/riscv64)	18s
Scan for vulnerabilities (linux/s390x)	25s
Test linux/amd64	14s
Test linux/arm	16s
Test linux/arm64	26s
Test linux/386	17s
Test linux/ppc64le	16s
Test linux/riscv64	25s
Test linux/s390x	25s
Push	0s
	12m 21s

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