Build Tarballs for each OS, Generate SHA-512 Checksums, and make Makefile easier to expand OS-Arch options.

[jeremyje]

This change primarily extends the Makefile so that OS-Architecture specific tarballs are produced during make build-tar. Each tarballs will be suffixed with $(GOOS)_$(GOARCH).tar.gz. For example node-problem-detector-v0.8.7-linux_amd64.tar.gz.

This change is backwards compatible so the original file locations will be preserved. The new locations are produced in an output/$(GOOS)_$(GOARCH)/ directory which acts as a staging area for the tarball contents.

make build-tar will now produce tarballs for Linux and Windows.
make push-tar will also push those tarballs to GCS.

*.tar.gz.sha512 checksum files are also produced for the new OS-Arch specific tarballs.
The Makefile has been tuned to allow it to be extended for different OS-Architectures in the future.

This change is primarily for #461 but also helps #135.

[jeremyje]

/retest

…

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[jeremyje]

I'm adding back the ./bin/* makefile rules because it can break the build if a user specifies make GOOS=arm64 ENABLE_JOURNALD=0 build-tar. The output will be a amd64 tarball rather than an arm64 tarball.

[Random-Liu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jeremyje, Random-Liu

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[jeremyje]

/sig windows
/sig node