Add GitHub Actions workflow to build grade-python images #6

Job	Run time
Determine base tag and full tag	2s
Build base image (linux/amd64)	37s
Build base image (linux/arm64)	47s
Merge base manifests	15s
Build y2 image (linux/amd64)	52s
Build math image (linux/arm64)	1m 9s
Build math image (linux/amd64)	1m 5s
Build psql image (linux/arm64)	1m 16s
Build xls image (linux/arm64)	35s
Build comp image (linux/arm64)	47s
Build rdf image (linux/arm64)	36s
Build ply image (linux/arm64)	36s
Build rdf image (linux/amd64)	22s
Build comp image (linux/amd64)	32s
Build ply image (linux/amd64)	23s
Build xls image (linux/amd64)	24s
Build psql image (linux/amd64)	53s
Build y2 image (linux/arm64)	1m 14s
Merge xls manifests	16s
Merge rdf manifests	12s
Merge ply manifests	15s
Merge comp manifests	19s
Build smt image (linux/amd64)	57s
Merge math manifests	12s
Merge y2 manifests	17s
Merge psql manifests	19s
Build ml image (linux/arm64)	51s
Build ml image (linux/amd64)	39s
Build mec image (linux/arm64)	39s
Build mec image (linux/amd64)	33s
Merge mec manifests	21s
Merge ml manifests	22s
Build jupyter image (linux/arm64)	42s
Build jupyter image (linux/amd64)	39s
Merge jupyter manifests	13s
	20m 11s

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