Add github workflow to run bazel build/test for our desired configura… #1

Job	Run time
Build/Test ubuntu-latest gcc fastbuild	28m 27s
Build/Test ubuntu-latest clang fastbuild	42m 40s
Build/Test ubuntu-latest gcc opt	40m 28s
Build/Test ubuntu-latest clang opt	1h 5m 27s
	2h 57m 2s

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