[tooling] Use make image
to build image
#273
Merged
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We compose a lot of make commands and shell scripts together, most of which need an up-to-date version of the monitoring image. Despite trying to signal build status through the DO_NOT_BUILD_MONITORING environment variable, we still repeatedly build the image on a single command invocation because that environment variable does not transmit through make files.
This PR resolves that issue by defining a well-formed make target for the image (correctly specifies its dependencies and generates a placeholder file with timestamp) and using that make target to build the image in all normal scripts (explicit build and release scripts still build the image regardless of currency).