extend build actions to copy docker images to old dockerhub repository #205

Job	Run time
Run code checks / Run code checks	19s
Build Dora / Build windows/amd64 binary	2m 39s
Build Dora / Build linux/amd64 binary	21s
Build Dora / Build macos/amd64 binary	4m 5s
Build Dora / Build linux/arm64 binary	1m 26s
Build Dora / Build macos/arm64 binary	2m 2s
Build Dora / Build amd64 docker image	20s
Build Dora / Build arm64 docker image	1m 35s
Build Dora / Build multiarch docker image	9s
Build Dora / Build additional docker manifests (master)	30s
Build Dora / Build additional docker manifests (master-latest)	13s
Create snapshot release	22s
Copy docker images / Clone docker images to pk910/dora-the-explorer	7s
	14m 8s

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