Change dockerfile base image

[mjudeikis]

Describe the PR
When building more complicated apps go is a mandatory dependency In the image due to

swag/golist.go

Lines 14 to 15 in 6cdaaf5

	cmd := exec.CommandContext(ctx, "go", append([]string{"list", "-json", "-e"}, args...)...)
	cmd.Env = env

So we need to use image with go.

Otherwise, it fails with error go not in path

In addition, can somebody confirm GitHub image latest works fine? We had to rebuild manually as one in GitHub looks corrupted.

[sdghchj]

Hello, rebase your branch on the latest master, please.