Use correct platform for `container_push` pusher binary #3044

Job	Run time
env-protect-setup	8s
authorize	2s
get-dev-image / get-image	7s
generate-matrix	3m 7s
clang-tidy	1m 14s
code-coverage	0s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	19m 53s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	28m 1s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	31m 36s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	17m 21s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	19m 47s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	36m 11s
build-and-test-status	3s
	2h 37m 30s

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