feat(staged-dockerfile): implement whether stage uses build-context correctly #5047
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This fixes panic when trying to use uninitialized build-context because of unimplemented UsesBuildContext method at the pkg/build/stage/instruction level. Also refactored pkg/build/stage/instruction a bit: common PrepareImage method implementation in Base.
refs #2215
Signed-off-by: Timofey Kirillov timofey.kirillov@flant.com